Remington 7400- 750 Autoloader Jamming Fix!!!

[Pops]

If your Remington 7400 or new 750 is jamming there is a very SIMPLE fix! The first thing you must determine is the type of jam you are experiencing. If your auto loader is NOT ejecting a spent round then this fix is the solution to your problem, If your auto loader is ejecting the spent round but not driving a live cartridge home then this is not the remedy and you should first try a new clip and a thorough cleaning (with one exception which i will explain later.)

If your Remington auto loader is CLEAN and well LUBED and you are not ejecting the spent casing then you need to remove the fore arm and with a quality pair of  large sharp jawed of diagonal wire cutters remove ONE coil from the return/mainspring. Place a piece of clear shipping tape on the receiver so that the edge of the tape covers the bolt handle slot just enough to cause the bolt handle shaft to "dent" the edge of the tape when it is pulled fully to the rear of the receiver.  This is the gauge to let you know when the bolt has been fully thrown to it's most rearward position in the receiver by the gas operation system. Your bolt MUST reach it's full rearward movement to engage the live round in the mag!
Load your clip with 4 rounds and one in the chamber to cause full pressure and drag on bolt.
Fire the rifle. If it did not eject the spent round, load a new round and "dent" the end of the gauge tape then clip another coil off and repeat the procedure.

Important to know is that you must stop clipping coils as soon as the tape is dented showing full rearward movement of the bolt! I have repaired many 7400's and a couple of the new 750's with this method and the worst that can happen is you clip too many coils and have to replace the mainspring and start over.
As long as the spring clipping was stopped as the bolt fully reached the rear of the receiver you will have ample spring pressure to close the bolt and load a new round.

P.S In the begging I mentioned an exception to the rule and here is the explanation.
If your firearm is ejecting a spent round but not picking up a new one then this fix will also work because most likely your problem is that the the bolt is traveling far enough to eject the round but not fully to the rear to pick up the live round.
Use the tape "gauge" at the rear of the bolt slot to determine if the bolt is traveling fully to the rear.
This method will put an end to the term JAMOMATIC.
 I have never over cut the spring by cutting one coil and testing ONE at a time. Every Rem. auto loader I have repaired in this fashion has stayed fixed and functioning perfectly.
good luck.

[briannmilewis]

I found a fix for the feeding jams, can't remember where but here it is. Easy, easy, easy.

2007-02-27, 02:27 PM
Perhaps my Remington auto experience may help 2faroffroad and others having feeding problems. Around 15 years ago I traded a Winchester 670 for a Remington 742, and the guy told me the 742 jammed which it did with bullet nose jamming into feed ramp only on right side of magazine. Using pliers and a handerchief to avoid scratchting magazine, I bent upward on magazine lip enough to allow rounds to pop up at greater angle and feed properly with no more jams in 15 years. Recently I purchased a 750 in 35 Whelen which had the opposite problem, i.e. rounds were popping up at too great an angle resulting in jam into top of chamber only on right side of magazine. Using same procedure of 15 years ago but bending inward on magazine lip until proper feed angle was achieved resulted in flawless feed for the new rifle. Note manual cycle of rounds from magazine is necessary to easily identify the problem which may be undetectable by actual firing. This procedure may not help all, but it should help where this magazine flaw is the culprit. BTW I've had a Remington model 4 in 308 for about 10 years which has never had any problem, and all things considered I like Remington autos. Incidentally I shoot only handloads in all centerfires including the autos in case anybody's interested.

It's somewhat surprising folks have guns returned after supposed repair without fixing the problem, and you'd think Remington should be able to figure it out if I can. However, around a dozen years ago the agency I worked for had S&W 9mm autos with cracked frames problems for which S&W just replaced the frames without fixing the cause of frames cracking which I had identified. I won't go into those details since it's unrelated to this topic, but it just amazes me how inept manufacturers can be in some instances.

[Syncerus]

You have just accurately described a culture of apathy.

This is great information though.

[obiwankabaldi]

Pops. just cut one coil off the spring and will try the weapon first thing in the AM. If this works I owe ya one....I mounted a scope on this weapon and it shoots fantastic, if you manually pull the lever. It ejects fine most of the time, (sometimes that misses also) but fails to pick up the next round a lot of times. At fifty yards I can almost keep bullets touching on a target. I wanted to really see what it could do but was so aggravated by having to fool with it that I quit at that point. Did a search adn found your fix....I can't wait to try it out. The gun is light manueverable and as I said shoots really sweet. It is a ,308 with the 18 1/2" barrel and I mounted a Leupold VI 2 - 7 X 33 on it....NY deer season is coming....

[obiwankabaldi]

Well, just got back from the range. The weapon seems to be working but I could not believe that I had to take 5 coils out of the action spring. I was about to give up, but never had gotten the slide lever to mark the tape. The fifth coil was the charm.. I actually got a full magazine to cycle throught the gun, and did mark the tape. Amazing. I cannot beleive that the spring length could be off that much. Again, thanks to POPS for posting this info. I need to get more ammo and put this gun to the test again.

[fishmasty]

 I was working on 270, 7400 that the bolt would not come all the way back on. After a very thorough cleaning (It was Filthy) and buffing the tube that is under the barrel it still would not fully cycle,.. I remover the little allen scerew removed the restrictor ball and cleaned the gas port very thoroughly (so I thought) after re-assembly T bolt still did not co,e all the way to the rear. I thought about cutting the spring, but figured it was designed with that spring for a reason and if anything the spring would get weaker in time and not stronger. I asked around and was advised to get the exact sized drill bit (each caliber has a different sized gas port in the barrel) The Guy looked up the size for a 270 and gave me the measurement. I took my mic. to the local hardware and measured  bits until I found the exact right size drilled the orifice out replaced the restrictor ball re-assembled it and it shot great. Hand loads or factory and any bullet weight. The important thing is the restrictor ball on top of the orifice and the EXACT sized drill bit to drill it out.

 I wonder how many people have called these jam o matics and this was really the problem. Hope this might help someone down the road.
 Cheers, Fish

[Harry Snippe]

It would be nice if this could be a sticky some place . Some where along the line some one might benifit from this article and it will have been lost .

[Elijah Gunn]

I'll second what Harry Snippe just said.

[DeerMeadowFarm]

I'll third it! 

[GunRookie]

While we're weighing in, I'll 4th it.   

[Tonk]

Now as I remember, the only FIX for a Remington Jam-O-Matic was to trade it in on a Browning Bar!!!

[corbanzo]

I'm gonna go ahead and use my magical powers to resurrect this thread, because it is just the ticket I needed! 

[gunnut69]

Cutting springs is not a good fix, usually.. The gun failing to project the bolt to its full travel is usually either a dirty/rusty chamber or insufficient gas being tapped into the system. There are other possibitlies but cutting thde spring creates a dangerous situation.. Should the real problem be resolved at a later time the rifles action will be badly over stressed perhaps to failure.. Find the problem for each rifle and repair as needed but re-engineering the action balance is a last ditch solution..