SIG Romeo X RDS installation on SIG M-18 Pistol (4K Video)

Today I'll walk you through all the steps of installing a SIG Romeo X RDS onto a SIG P320 M-18 pistol. Some disassembly required but you can handle it!

[@nickb1690]

Very informative with great photography. Well done .

[@SoCalPlaneSpotter]

Thank you! If you're interested in any other Sig M-18 content please let me know.

[@5.56NTO]

most detailed video about anything iv ever watched in my existence...

[@SoCalPlaneSpotter]

That seems a bit much but I am glad it helped!

[@ghost_rider2896]

Getting this exact set up on mine next week.. thank you for this video its going to help me out alot!

[@SoCalPlaneSpotter]

You’re very welcome! Make sure you use only a 3/32” Allen wrench to get the screws out of the cover plate. When I took mine off the first time they were extremely tight. I tried using a metric Allen wrench and it wasn’t fitting right and I almost stripped out the screw heads. If you use an exact size you’ll be good.

[@ghost_rider2896]

Thanks bro appreciate it very much ..and I'll make sure I get the correct one.

[@shareefk9039]

This is the military version correct. The civilian optic is not out still..?

[@MrPerry61]

I have the Romeo X Compact. Before these came out I tried, and hated the Romeo Zero optics. These new Romeo X's have redeemed the Sig Pistol optics in my opinion.

[@SoCalPlaneSpotter]

I’m happy with mine but am dealing with an issue where it refuses to co witness with the iron sights. I don’t know what that’s about.

[@MrPerry61]

@@SoCalPlaneSpotter I'm just a hobby shooter but co witnessing has never been an issue for me. I think it's just another buzz word "experts"

[@MrPerry61]

My Fuse seemed to shoot right of the iron sights, after I zero's the X compact sure enough it shoots right, and the best I can tell is the sights are perfectly centered in the dovetails

[@stileshumphrey4195]

Great explanation 👏🏻

[@SoCalPlaneSpotter]

Glad you liked it!

[@reginald8703]

For some reason, 5/64 allen key worked for me to remove the screws that held the plate and rear sight. Great tutorial though :)

[@jochenheiden]

5/64 is 1/64th smaller that the directed size of 3/32”. It probably worked but I don’t recommend using anything but the size recommended.

[@reginald8703]

I was trying the 3/32” and was struggling with it. Nonetheless, 5/64” worked 😀

[@jochenheiden]

@@reginald8703 Good to go then! As long as it worked and you don’t strip out the screws you’re all set. Happy shooting.

[@reginald8703]

@@jochenheiden you as well, friend

[@jochenheiden]

@@reginald8703 thanks! PS I am the creator of this video on my other YT channel. Sometimes I forget which account I am replying on.

[@michaelking1009]

Great video! Thanks for sharing.

[@SoCalPlaneSpotter]

Thanks for watching!

[@claybattles5749]

The narrator did not mention the extractor that fell out until the reassembly was taking place. Also, no mention of using locktight on the screws. The narration was clear and crisp. The video work was great.

[@SoCalPlaneSpotter]

I didn’t mention it because it wasn’t relevant until the reassembly. I didn’t mention using any Loktite because it wasn’t specified in the instructions for installing the sight and it’s not necessary. Being a countersunk screw there is enough friction to keep the screw tight. I’ve got a few hundred rounds through the pistol now and nothings cone loose on me. Thank you for the compliment!

[@luciano_acandrade2037]

Hey, great video. Thank you very much for the help. Any videos on how to calibrate the red dot?

[@SoCalPlaneSpotter]

I don’t have any but there many on how to zero the red dot sight.

[@WithOneInTheChamber]

Thanks for the video. Super helpful!

[@SoCalPlaneSpotter]

Glad it helped you!

[@osoman818]

Shouldn't we put some locktite on The screws? Also, shouldn't we use proper torque pounds/inches when mounting an optic?

[@SoCalPlaneSpotter]

Go ahead! I'm sure it won't hurt. I used my calibrated elbow and no Loktite and the sight is staying on just fine. Do your thing.

[@marcheadley9628]

Awesome tutorial

[@SoCalPlaneSpotter]

Thanks I’m glad it was helpful!

[@pepsiguy5028]

Great video thanks for sharing. I am also in CA looking to possibly buy an M18 myself now that they are available in CA what are your thoughts on it?

[@SoCalPlaneSpotter]

So far I am very happy with it! I am in the military and we switched to the M-18 from the M-9 (I have an M-9 too). I feel like the handling and grip and natural pointing characteristics are great with this M-18.

[@pepsiguy5028]

Awesome thanks for letting me know. Definitely the next gun on my list to buy. Also thank you for your service!

[@SoCalPlaneSpotter]

Thanks man! I think my next video will be comparing the M-18 to the M-9 as I own both and have carried both in the military now.

[@jeffnpatricia]

Thanks. Next stop the mag trigger lockout video 😂. 😎✌🏻

[@SoCalPlaneSpotter]

I want to do it but I am afraid KZbin will get mad at me for showing gun mods. What do you think?

[@jeffnpatricia]

@@SoCalPlaneSpotter ya KZbin doesn’t like a lot of random new things. It’s not worth it.

[@jeffnpatricia]

Maybe rumble or X

[@SoCalPlaneSpotter]

I am trying to monetize this channel.

[@ivaniuk123]

You can now get the romeo m17 for the m18. That's a great but expensive optic.

[@SoCalPlaneSpotter]

How much? I paid over $400 for this Romeo X!!

[@SoCalPlaneSpotter]

@@jimg5730 Can you explain more about that! I haven’t heard that.

[@SoCalPlaneSpotter]

Does seem silly that they went with two different patterns for the same pistol. I think the two-screw setup is superior. I haven't heard anyone at work saying that they have experienced issues with the rear sight flying off, but I don't think we're putting hundreds of rounds through these things often.

[@rogueasi8637]

Any issue with romeo x housing staying center on frame with only the rear screws and no posts near front when fires?

[@SoCalPlaneSpotter]

I’ve only got about 100 rounds through the pistol so it’s hard to say. That and I am not the worlds best pistol shooter so it’s hard to say if the POI shifting is due to the sight moving or my horrible trigger pulls. 😂 that being said the sight fights snugly on the frame, like it was made to fit there. I don’t think it’s going to move.

[@Tito_Soto]

Optic cutout on sig slides have a slight dovetail to help with centering but I suggest pushing the optic forward towards the ejection port prior to tightening the mounting screws due to inertia force from the slide reciprocating.

[@SoCalPlaneSpotter]

Certainly can’t hurt. I did have some forward and down pressure when tightening due to the loaded chamber indicator.

[@rogueasi8637]

I was having issues but tried this with forward pressure and blue loctight. Seems to have worked.

[@SoCalPlaneSpotter]

Did this video help you or was it something else?

[@need2retire543]

Does the LCI still function with the Romeo sitting near it?

[@SoCalPlaneSpotter]

Hello! The LCI is still fully functional but difficult to use because the Romeo X sits up right next to it. You can’t really visually see it and you have to reach a finger around to feel it, but it does function.

[@jayshredds2464]

Very informative. I’m looking at the M18 but I don’t like the stock grip. Do you know of any aftermarket grip modules that fit the M18 Ca compliant. Thank you

[@SoCalPlaneSpotter]

Thank you! Check out Wilson Combat, they make aftermarket frames that a lot of people say are better than the stock Sig one: wilsoncombat.com/grip-module-wcp320-carry.html

[@jayshredds2464]

@@SoCalPlaneSpotter thank you for getting back to me and with the information. Much appreciated however, I’ve looked into the WC grips and from what I’ve seen they don’t quite fit the M18 Ca trigger system. They had to Dremel to make space for the back of the MCU to fit. Thanks for sharing really enjoying the channel.

[@SoCalPlaneSpotter]

Honestly I haven’t done a ton of research into it because I am quite happy with the stock SIG frame on my pistol right now. I wonder if it’s the CA-added magazine disconnect that’s causing the issues? I am planning to delete mine soon. Maybe another video?

[@cesarherrera6745]

The WC module does fit, just need to remove the mag disconnect which is very simple, just one screw needs to be removed. Just did mine today. Follow sig guy for detail instructions

[@RocksNRuts4]

anyone have advice to push the front post, it wont budge.....pusher tool doesnt hold it well due to lower ring....

[@SoCalPlaneSpotter]

I haven't tried messing with my front sight post yet. Isn't it just dove-tailed in there? Why not drift it with a punch with the slide in a vice?

[@SquadSoldier209]

Nice video very useful

[@SoCalPlaneSpotter]

I’m glad it helped!

[@bendufour6348]

Very helpful thanks

[@SoCalPlaneSpotter]

You're welcome! I'm glad it helped.

[@omargonzalez4919]

Great video thanks!!

[@SoCalPlaneSpotter]

I’m glad it helped!

[@omargonzalez4919]

@@SoCalPlaneSpotter I subscribed

[@SoCalPlaneSpotter]

I appreciate it.

[@user-qf3pl2ul1i]

Dude thank you

[@SoCalPlaneSpotter]

You’re welcome! I hope it helped you.

[@5.56NTO]

anyone have any experience with the romeo x pro and m17 in a safariland holster? if yes what optic option must be selected

[@SoCalPlaneSpotter]

I tried using one of military issued Safariland holsters with my M18 with the Romeo X on it and it definitely doesn’t work. I’ll need to find the one that can accommodate an RDS.

[@5.56NTO]

@@SoCalPlaneSpotter thank you for that information, I’ll probably have to call them and ask directly.

[@duckloydduckett9877]

Hey brother kind of new here! I installed a flat trigger on my P320 M17. It has a delay on the pull for some reason. Do you know what is causing this issue? The original curved trigger works fine.

[@SoCalPlaneSpotter]

Unfortunately I haven’t changed out the trigger and I am not a gunsmith so I don’t want to mislead you, but it sounds like there is excessive play between the trigger and sear.

[@duckloydduckett9877]

Totally understand! Thanks

[@32sRus]

Is the the Romeo X compact or Pro?

[@SoCalPlaneSpotter]

This is the Pro model

[@umbertoverdolini9339]

Do you know the size of the allen key for loosen the screws of the original plate? Can’t find anything about that

[@SoCalPlaneSpotter]

3/16” for the screws holding the plate on.

[@rjhamilton7397]

Hey, so I just put an M18 on layaway at my local range. I’ve read that the military is having problems with the rear sight flying off on recoil, any truth to this? But I guess the military version only has one screw holding in the rear sight.

[@SoCalPlaneSpotter]

I am in a military service that uses iron sighted M-18s and I have not heard anyone tell me there has been an issue with the rear sight coming off. As you can see from my video, there are two screws holding the rear sight on this model and they have blue Loktite on them and I don’t foresee them going anywhere. All the same if you put this RDS on the pistol you’ll get the rear sight integrally added that way.

[@stephenhenderson7875]

I have the M17 will this site work on the M17?

[@SoCalPlaneSpotter]

Double check before you buy, but I can't see why this would not fit. The M-18 and M-17, aside from the barrel and slide length, should be identical on the back end of the pistol.

[@dream_myking]

From someone who is in the military. One military personnel in general dont take care of shit. Rather beat it up and let the next person deal with it. Secondly its absolutely possible manufacturers cut corners trying to fill such large order and in timely manner. Just a number of factors not aggressed in scenario

[@SoCalPlaneSpotter]

I’m not what sure relevance this comment has on installing a Romeo X RDS on an M-18.

[@shanthakopian2915]

Will the vortex defender ccw work with the M18 Cali edition

[@SoCalPlaneSpotter]

I don’t want to give you bad information so I’ll let someone else answer. I don’t honestly know. This Romeo X is my first ever pistol mounted RDS so it’s all I know.

[@shanthakopian2915]

Thank you

[@shanthakopian2915]

@@SoCalPlaneSpotterwhat size is the Allen wrench 3/32?

[@SoCalPlaneSpotter]

@@shanthakopian2915 3/32" Allen wrench, very small. It's smaller than 1/8"

[@TxAg8811]

Do happen to know what kinda of plate I would need for my M18 to fit a RMR type sight on it?

[@SoCalPlaneSpotter]

Unfortunately I don't! I specifically bought this Sig Romeo X sight for my M-18 because I knew it would be compatible. I'm a life-long iron sight shooter so this is my first RDS.

[@betlogenako7193]

What you used to remove that front carbon?

[@jochenheiden]

I haven’t even tried to clean it yet. I will probably try using some Hoppes on it.

[@SoCalPlaneSpotter]

It's Patina! Why clean it? Just kidding, I don't know, I haven't tried yet!

[@Tinkerdadhq]

Did you get the RMC-C version or the Pro sight?

[@SoCalPlaneSpotter]

This is the Pro version.

[@danielto3060]

How come your red dot didn’t have rear fiber optics ?

[@jochenheiden]

I guess because the model I got didn’t come with them. 🤷🏻‍♂️

[@SoCalPlaneSpotter]

This particular model doesn't come with that.

[@BruceTheJuice]

What was your torque setting for this?

[@jochenheiden]

German torque: Guten Tight. Just snug it up.

[@MrPerry61]

using that torx tool you basically can't over tighten using your two fingers. however if you have an inch lb torque screw driver you'll find the specs in the included book.

[@bmphil3400]

Sig insists on making every model a little bit different than the other. My xcarry and full size x series have a rear sight dovetail and two screws removed from the top. I am a professional mechanical engineer.....these things enrage and baffle me so much as they think they are protecting their market share....when in reality they make me shy away from their idiotic ideas.

[@SoCalPlaneSpotter]

I am not an engineer so these nuances are definitely lost on me.

[@bmphil3400]

@@SoCalPlaneSpotter so here is a question. If you wanted to use a Romeo 1 pro red dot how would you be able to have a backup rear iron sight?....see what I mean?

[@SoCalPlaneSpotter]

@@bmphil3400 can’t say I understand as the Romeo X is the only RDS I’ve ever had and it has the rear sight integrated into it.

[@stevenrubin9021]

i suspect the M18 is far more complicated to remove the optic plate at the request of the military. This is the Marine Corps standard pistol.

[@proudbrownconservative]

You know you can take the trigger lock out right?

[@SoCalPlaneSpotter]

I am aware. I haven’t gotten around to it.

[@MrPerry61]

why? Did it occur to you he bought this model because of the manual safety? I have a new P365 Fuse, and I'm installing a manual safety. I found one that has the same nickel boron finish as the trigger. Why? Because I want one. America!

[@SoCalPlaneSpotter]

@@MrPerry61 I am in the military and the issue M-18s we have do not have the magazine interlock. It’s not a feature I want on my home M-18 either. I don’t want to have to keep a magazine in it to pull the trigger. In my opinion it induces more safety issues than it resolves.

[@proudbrownconservative]

@MrPerry61 honestly did not even think about it, mine had both

[@MrTyrockjr5]

Is this the Romeo X compact sight or Romeo X pro sight ?

[@SoCalPlaneSpotter]

This one is the Romeo X Pro.

[@MrTyrockjr5]

@@SoCalPlaneSpotter thank you !

[@SoCalPlaneSpotter]

My pleasure!

[@julianjimenez25]

Will the Romeo x compact fit too?

[@ramblindart144]

Do you have the serial # of this optic? Thank you for the video!

[@SoCalPlaneSpotter]

You’re asking for the SERIAL NUMBER? Sorry that’s classified! You working for the ATF??? 🤣

[@ramblindart144]

@@SoCalPlaneSpotter haha no sir! Just looking for the same model for my M18- and thank you I have found it!

[@adanserrato9881]

What might of happen if my mag won't got in?

[@SoCalPlaneSpotter]

Hard to figure out via KZbin. I have a Discord server you can send me pictures if you want, maybe I can help you figure it out: discord.gg/v4A9STzW7R

[@miroslavalbert1513]

What is the size of Hex key ??? 3,32 ??

[@jochenheiden]

The screws that hold the plate and the rear sight on are 3/32” Allen key.

[@miroslavalbert1513]

@@jochenheiden THX

[@SoCalPlaneSpotter]

What he said! 3/32” Allen for the screws on the pistol. The screws that hold the sight onto the slide are included with the Romeo X in the box. One is for adjusting and zeroing and the other is for the two screws that hold it on.

[@bonvaicu]

nice video.,,, 👌

[@SoCalPlaneSpotter]

Thanks man I appreciate it!

[@Fajah69]

This optic is more expensive than my handgun lol

[@SoCalPlaneSpotter]

I probably could have gotten something cheaper but I’m a SIG snob. What can I say?

[@jeffnpatricia]

It looks like a glob because it’s a cheap dot. I mean I like it , but it’s a beginner dot imho

[@SoCalPlaneSpotter]

It’s the camera making it look this way. In person it’s lot more crisp.

[@jeffnpatricia]

Agreed. I have the Romeo 1 and it’s still just an average performing dot for what they got me to pay for it 😂. But I get the video does it no justice.

[@SoCalPlaneSpotter]

It’s my first red dot ever and I probably paid way too much but I’m a SIG snob until I die!

[@Josh_Sklar]

A sig rep told me not to remove the rear sight

[@SoCalPlaneSpotter]

With this pistol and sight combo it is impossible to leave the rear sight on. The screws that hold them to the slide don’t go through the Romeo X, it covers them over. Check the video to see what I mean. The Romeo X has iron sights integrated into it.

[@Josh_Sklar]

I agree with you 100%. When he told me to leave them on, I was like what? It interferes with my line of sight @@SoCalPlaneSpotter

[@Josh_Sklar]

I have the P365XL 3.7" ROMEO-X COMPACT SLIDE ASSEMBLY@@SoCalPlaneSpotter

[@SoCalPlaneSpotter]

@@Josh_Sklar Maybe he was confused!

[@SoCalPlaneSpotter]

Is this your EDC? How do you like it?@@Josh_Sklar