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+--- Thread: Bcg sticks (/showthread.php?tid=25459)
Bcg sticks - drykilned - 03-02-2023
THE PROBLEM: bolt carrier group cycles easily manually WITH NO ROUND CHAMBERED. IS VERY DIFFICULT TO CYCLE MANUALLY WITH
ROUND IN CHAMBER. Does not extract fired round.
I have 2 identical grendels, intentionally set up identical so all parts are interchangeable. Grendel #1 works flawlessly. Grendel #2 is the problem child. I have take the bcg out of the good one and tried it on the bad one. Did not work, eliminating bcg as being the problem.
I have installed the complete bad upper assembly on the good lower. Did not work, eliminating the buffer/spring as the problem. I can put the
bad bcg in the good upper on the bad lower and it works. So, to me that means the problem is in the barrel. Do you agree with that LRRP52?
If it was a gas problem, I would not have problems cycling manually.
Anybody got a suggestion short of replacing the barrel? No headspace gauges are available to me at this time. I suspect too little headspace.
Loaded dummy rounds fall out of barrel when barrel is raised. I guess I could have decreased headspace by over torqueing?
I have built a 5.56, 2 Grendels, 4 7.62x39s and 1 300 Blackout. No problems with any of those, except THIS ONE. All on Anderson upper and
lower receivers, various BCGs, all BCA barrels. All are super reliable and the 5.56, 300 and good Grendel are MOA capable when I am good.
The AR47s do 1.5-2" at 100 with surplus ammo.
Bcg sticks - Happy2Shoot - 03-04-2023
I assume you do not reload?
If you did, you could try over sizing a case to be shorter, and then chamber it. If it worked better then you would know you had a short head space.
Actually, color a fired case from the good rifle with a marker and chamber it a few times in the good rifle. Look for rub or scratch marks everywhere but specifically on the body to shoulder to neck junction area.
Recolor that case if needed and chamber it in the bad rifle a few times. Report back with the differences between the two rifles.
Bcg sticks - Happy2Shoot - 03-11-2023
@drykilned
any news to share?