Remington Model 7400 740 742 full disassembly & reassembly. Diag action wont fully eject and cycle.

[@MrRollingBlock]

I have just watched 6 of these and yours is by fare the very best. No one else addressed the 'carbon' as you did. I see where the gas port can be the main problem. Thank you

[@CustomFirearmSolutions]

@@MrRollingBlock thank you for the feedback!

[@brianhoxworth3881]

Excellent video. Ive got one in 243 that lived its past life in Florida as a hog gun.. its new to me, and definitely need a deep clean. Thanks

[@peterparsons7141]

Thanks for that. What’s really interesting is that millions of these rifles get used and abused and only a very few ever get cleaned.

[@CustomFirearmSolutions]

@@peterparsons7141 this design was about the best they could make for a no maintenance action, but their quality control on the gas block was unfortunately its downfall. As a gunsmith i really wish they would bring this design back in more rifles, it would really help the short lifespan of these poorly made rifles of today.

[@MichaelSkuse]

Great Video, I just tore down my first 742. Hardest part getting the charging handle pin out. I'm guessing from this and other video they were knocked out and place back in before the video or edited out. Watched other video's were the guy's just took a couple tap's to get it out, I call B.S. HAHA. Again thanks

[@CustomFirearmSolutions]

@@MichaelSkuse ive had some come easy, any many, many bend punches trying to get them out. Luck of the draw lol

[@dizzzzzy3D]

Just bent 2 punches trying to get mine out. Taking a break before I toss the whole damn thing😂

[@mikedragon5553]

Great video . On the gas block when you remove the threaded plug is thee BB supposed to come out in the same direction as the threaded plug? Thanks

[@CustomFirearmSolutions]

@@mikedragon5553 yes, it should fall out right where the plug was removed. There is a good chance there will be some carbon buildup that may prevent the ball from falling out. You may need to put a couple drops of solvent in there overnight.

[@mikedragon5553]

Ok it’s not moving. I have filled the cavity with Kroil for 48 hours now trying PB Blaster. I have no blockage on the gas system at all and gun functions fine. Thanks for getting back to me

[@danielbornhorst6243]

This is a great video. I have one of these guns, it was my grandfathers. I recently had a Boyd’s stock placed on it after the wooden for end cracked. The Boyd’s has cracked twice now and is going back to the gunsmith again. I wonder now if it’s a gas port problem. Parts are so hard to find. I’d love to find another fore end.

[@CustomFirearmSolutions]

@@danielbornhorst6243 ebay is a good place to find wood for these actually. Have a saved search set up and the forends pop up here and there.

[@ProWalter2]

3:20 what size roll pin punch did you use for that retaining pin?

[@CustomFirearmSolutions]

The pin is a 0.200 diameter roll pin, but it tapers down on the ends, allowing you to use various sizes. If you have a siezed pin, you can use an over sized punch to break it loose, then use a smaller punch to push it through. The punch i use for this is 0.150 diameter, but anything around there should work fine as long as the dimple at the end of the roll pin punch seats inside the center hole of the roll pin

[@JAD-fb6ur]

Question about the lubrication. I did not take the bolt assembly out, but I did take the forend off and scrubbed with hoppes where a bunch of carbon was. Do I lubricate or oil the spring and tube? And the trigger was a little gunky too, do i just drip a oil on moving parts? Also mine did not come with a breech cover plate and the nozzle is naked. Is this ok?

[@CustomFirearmSolutions]

@@JAD-fb6ur you only need a small amount of oil in the action. I put a couple drops inside the receiver where the bolt rides, and i just a spray bottle and give a spritz to the action spring just to keep things from rusting

[@JAD-fb6ur]

@CustomFirearmSolutions thank you. I believe I way overlubricated it.

[@timothymanning4246]

My father gave me his Remington 7400 chamberd in 308 its wierd it will fire clear the spent round but not chamber the next rack it fire it ssme thing the spent round will eject but click didnt chamber the new round do you think cleaning the gas chamber will help

[@CustomFirearmSolutions]

@@timothymanning4246 theres a few things that can cause issues feeding, but yes, always clean first. It is possible the action is being pushed back just far enough to eject, but not all the way back to grab the next round and feed. From there if your gas system checks out, id look more into the feeding half of the action and inspect all parts for wear and loose tolerances.

[@Pookytootinalil]

I cannot get the little pin out of the charging handle. Any ideas? Bent multiple punches trying to get it out but it’s not budging

[@CustomFirearmSolutions]

@@Pookytootinalil Make sure you are using a proper roll pin punch, not a tapered punch. Also make sure you are punching from the top downward, it will only punch out that way. If its never been out before and its siezed in, it can be extremely carefully drilled out and replaced with a new pin, but if you're not comfortable with doing so i would not attempt. Ive had some stubborn pins in the past, once you bend a punch on those small diameter guys that punch will be difficult to apply full hammer pressure straight downward and will most likely keep bending the punch. I would block the gun up in a vice, get a brand new roll pin punch or flat face punch and give it one real heavy whack to break it loose. Also, dont be afraid to try and get a drop of solvent to sit in the area over night.

[@Pookytootinalil]

@@CustomFirearmSolutionsawesome thank you very much

[@ClarkPhillips-g8k]

Not worth it Put a 45 swab with polishing compound on reverse in chamber send cleaning rod down barrel and screw together put drill on cleaning rod and spin

[@jc114-i9w]

Any recommendations on how to make it not jam? Ive got one in 270 that sits in a safe because it jams every shot and rips the lip off the casing trying to eject the shell. Ive tried cleaning the chamber really good thinking maybe there was some buildup in there but no luck.

[@CustomFirearmSolutions]

@@jc114-i9w if its riping the lip off, that is a tell tale sign that the chamber is alowing the brass to expand beyond design. Most likely your headspacing is off, or you have scaring in the chamber thats holding the spent brass tight when it expands. First thing check your headspacing. If your headspacing is too far, it can be very dangerous to shoot; the gun can explode. Id recommend taking to your local gunsmith, or you can ship it to me and i can diagnose it for you.

[@jc114-i9w]

@CustomFirearmSolutions the times it done it to me before, I had to take a cleaning rod and knock the casing out the chamber and the sides of the casing were scratched up pretty bad. I'll look around and try to find a gunsmith to take it to and get them to check headspace. I don't use the gun anymore as I bought a new Xbolt and put the 7400 away. Someone brought up about the 7400's the other day in conversation and that's what got me to thinking about it again. I liked the gun, and it shot well, just got frustrating when it kept jamming.

[@ClarkPhillips-g8k]

​@@jc114-i9wsee second reply on first comment

[@ClarkPhillips-g8k]

Third reply

[@ClarkPhillips-g8k]

Third reply on last comment?

[@terryrauh6647]

I just bought a 7400 in 243 I disassembled it like you showed. Mine didn’t have the little ball in the gasblock. Do they all have one? The guy I bought it from said after a few rounds it wouldn’t eject the fired round. He said if he let it set for a few minutes it would eject the round. I haven’t fired it since I di a good cleaning. Thanks for your video.

[@CustomFirearmSolutions]

@@terryrauh6647 every one ive taken apart had the ball. If yours dosent have it, it should still eject, it will just be over gassed and beat up your internal parts over time. Based on what your describing theres a few things that could cause that problem, but i would need more info or pictures of the spent brass and chamber. Id look at things like the chamber to make sure it isnt scored or scratched to the point where the expanded fired brass holds onto the chamber walls making it difficult to eject until the brass cools down and shrinks slightly releasing its hold. Secondly take a look a your gas block where its soldered onto the barrel, these are known for breaking off or cracking which again once it heats up the cracks will expand and gas will flow out the crack and not allow for proper cycling.

[@terryrauh6647]

@ I will be firing it tomorrow to see what it does. When I had it apart I took a bore brush the size of the chamber and cleaned the chamber so I will see what happens. Thanks for a reply. I will let you know how it does. Thanks again

[@terryrauh6647]

I fired this 7400 today. First 5 rounds did good then started having ejection problems. By the 9 th round the spent round would not come out until gun cooled about 10 minutes then it came right out. The shell casings got dirtyer and dirtyer and the primers ate flattened like high pressure. The gun shot 4 inch groups at 100 yards. What do you think ? Tried 2 factory ammo.

[@CustomFirearmSolutions]

@@terryrauh6647 i would lean twoards a chamber issue. From here i would need to inspect in person to give you a diagnosis. You can look up Custom Firearm Solutions in Crandon WI and get in touch. You can ship your rifle to me and i can perform repairs and ship it back to you

[@darrelllane8353]

I recently bought one in 270 and need some replacement parts do you know where to get some quality parts from

[@CustomFirearmSolutions]

@@darrelllane8353 several places online. Search midwest gun works and gun parts corp first, those are my first go-to's, but there are countless places online, even ebay!

[@PatrickCumashot]

Hello, it's possible to replace the barrel without removing the bolt correct?

[@PatrickCumashot]

My Dad gifted me a 7400 30-06. The gas block on the barrel has been soldered back on. The gun is ejecting shells but not reloading. I couldn't get the set pin out of the gas block (probably fused during the soldering) to clean the gas port. So I just order a used barrel. Thanks for the video.

[@CustomFirearmSolutions]

@@PatrickCumashot yes just pull the bolt back when you remove the barrel.