10.5" Bolt of base malfunctions

**bubba04** · 12-13-14, 11:00

Buddy has a LMT 10.5" upper with BCM BCG. Currently runs the gun suppressed. When suppressed he is periodically experiencing bolt over base malfunctions. Gun is currently running an H3 buffer with standard spring.

My thoughts was to go to the A5 system and run the heavier A5 buffer. Question is with the LMTMWS buffer tube work as the buffer tube? I remember reading the MWS buffer tube was the same length as the A5, but wanted to confirm.

Also are the general thoughts that this will be a solution.

**Outlander Systems** · 12-13-14, 12:06

Verify it does this only when suppressed.

Throw an H or a CAR buffer in it, and see what happens.

What type of ammo is this occurring with?

**MegademiC** · 12-13-14, 13:10

Is a malfunction like this typically from a slow or fast bolt? Seems that bad mag springs could cause this?

**Outlander Systems** · 12-13-14, 13:42

Originally Posted by MegademiC

Is a malfunction like this typically from a slow or fast bolt? Seems that bad mag springs could cause this?

Could be a bad mag, but it sounds like the Sumbitch is short-stroking. That's why I was curious if the problem occurred unsuppressed. I am guessing small gas port + weak sauce ammo.

**BufordTJustice** · 12-13-14, 15:06

Check gas rings, gas key, and gas block for signs of leakage and wear.

**bubba04** · 12-13-14, 15:09

Issue only hAppens suppressed. Bcg is out running the magazine follower.

Over gassed is my thought.

**MegademiC** · 12-13-14, 20:27

Originally Posted by bubba04

Issue only hAppens suppressed. Bcg is out running the magazine follower.

Over gassed is my thought.

what mags ammo? Ive noticed in some pistol mags, steel cased ammo with laquer or poly coating would stick and cause malfs from slow feeding. If mags and ammo are confirmed good, and ur using an h3 buffer that sounds really overgassed.