Bolt Carrier Group stuck

[fghtclb 0]

I have a 7.62x39 Saiga. I converted it with Mississippi auto arms parts and a Dinzag bullet guide. I used a flat screw for the bullet guide to make sure there is no interference.

 

Whenever I shoot the rifle it will fire once or twice and then the bolt carrier locks back and appears to have fallen off the rails of the receiver. Any ideas on why this would happen? It works fine with snap caps, but falls off the rails when I shoot live ammo

[thebuns1 4,323]

What parts were used, and do you have pics?

[fghtclb 0]

I used a brand new Saiga 7.62x39 and the following parts from Carolina Shooter Supply

1 of : -BASIC KIT #1-CSS (1-Modified Tapco G2 FCG with Retaining Plate 1- Bolt on Carolina Billet Trigger Guard)

 

1 of : AK47 MAGAZINE TAPCO 10 ROUND AK/SAIGA

 

1 of : HANDGUARD RETAINING LOWER BRACKET SAIGA 223, 5.45, 7.62 RIFLES

 

1 of : TRIGGER GROUP HOLE PLUGS FOR SAIGA CONVERSIONS

 

1 of : TRIGGER GROUP-SAIGA RIFLES, 410 & 20 GA. MODIFIED FIRE CONTROL GROUP

 

1 of : TRIGGER GUARD-CAROLINA AK47 SAIGA RIFLE BOLT ON "BILLET"

Dinzag Bullet Guide

 

Here are some Photos https://drive.google.com/folderview?id=0ByYwBgfNppnCX0c3SkxIRWdvUVU&usp=sharing

 

 

 

 

Thanks

[scattergun10 125]

Are you sure the bolt carrier is seated on the rails properly?

[DrThunder88 912]

Does it pop the dustcover off?  Are you using a recoil buffer?

[G O B 3,516]

Sounds like the carrier is coming out of the rails at the rear of the receiver. Put a BlackJack buffer in there and forget about it.

[fghtclb 0]

Sorry, I forgot to mention I was using a AK-47 AK Valmet Galil Recoil Buffer.

 

The dust cover did not pop off.

 

I almost positive the bolt carrier is seated properly, every time I tried I was able to get 1 or 2 shots off before it came off rails and jammed.

 

thanks everyone for your help, any other ideas?

[XdamagedX 248]

Might try getting a set of dial calipers and checking the outside measurement of the bolt carrier/inside of the carrier channels, and the inside measurement of the "rails" and comparing them together, as well as comparing to another members parts.

Another thing might be to see if the carrier is slamming back into the rear trunnion (wear marks possibly?)

A last guess would be the recoil spring orientation and strength. I've HEARD the spring will cause issues if it's backwards (not sure of any truth to this). 

 

Did it function fine before conversion?

Edited April 10, 2014 by XdamagedX

[mancat 2,368]

Hopefully you didn't hammer on the receiver during the conversion process and warp it in some way. May want to check the top rails to make sure the receiver isn't bowed outwards on either side towards the rear.

 

It should be fairly easy to notice by looking at the receiver rails top-down.

[DrThunder88 912]

I was going to suggest losing the recoil buffer and seeing if the problem persists.  I had a problem with one catching and holding the bolt carrier on my .308 Saiga, especially in cold weather, so I know they can interfere with cycling.  I'm astonished to know the bolt carrier can jump the rails without moving the recoil spring assembly.

[poolingmyignorance 2,191]

Disassemble your rifle. Measure it for parallel across the rails in three spots. Also compare too the measurements at the trunnions. It should be easy to measure inside dimension of rail to rail, versus the inside to inside dimension of the slots on you bolt carrier.

If your receiver is widened some how it might be fixable by simply squeezing it gently at the top of the receiver back into parallel. Be sure to measure first.

[fghtclb 0]

I finally figured it out, for whatever reason the Bolt Stop was getting in the way. I removed it and the problem is resolved.

Thanks everyone for your help

[beefcakeb99 572]

Haha there are tricks to keep it in place but thats what I do, just toss em on my conversions