JeepHammer
Moderator
I have a Colt 7.62x39mm Upper, 20" barrel.
This thing has NEVER cycled the bolt fully.
I've opened up the gas port in the barrel,
The gas port in the front sight,
I've used the largest diameter gas tube I can find,
I've went the other way, restricting the gas to the tube.
I've tried different buffers, springs, ect.
Nothing works, the bolt simply isn't getting fully to the rear to strip the next round off the magazine.
(Yes, Using 7.62x39R Mags from Colt)
Since I bought the barrel/bolt/gas block/sight, all from Colt, I would *Assume* they would work together in standard AR Upper receiver.
It's a Colt factory flat top upper receiver.
I've tried other uppers receivers, and none worked no matter how much tweaking I did...
I've seen a bunch of 7.62x39R uppers that did function,
But all of them were 16" barrels, gas block moved backwards on the barrel.
Anyone have this same issue and how did you fix it?
Am I going to have to cut a gas block pad and drill a gas hole at the short barrel length to get this thing running?
Or is there something I've been missing all this time?
I've never had an AR I couldn't get running before,
This thing defies all attempts to get that bolt carrier/bolt to the rear...
This thing has NEVER cycled the bolt fully.
I've opened up the gas port in the barrel,
The gas port in the front sight,
I've used the largest diameter gas tube I can find,
I've went the other way, restricting the gas to the tube.
I've tried different buffers, springs, ect.
Nothing works, the bolt simply isn't getting fully to the rear to strip the next round off the magazine.
(Yes, Using 7.62x39R Mags from Colt)
Since I bought the barrel/bolt/gas block/sight, all from Colt, I would *Assume* they would work together in standard AR Upper receiver.
It's a Colt factory flat top upper receiver.
I've tried other uppers receivers, and none worked no matter how much tweaking I did...
I've seen a bunch of 7.62x39R uppers that did function,
But all of them were 16" barrels, gas block moved backwards on the barrel.
Anyone have this same issue and how did you fix it?
Am I going to have to cut a gas block pad and drill a gas hole at the short barrel length to get this thing running?
Or is there something I've been missing all this time?
I've never had an AR I couldn't get running before,
This thing defies all attempts to get that bolt carrier/bolt to the rear...