Thanks for your useful input.
I keep a LPK, gas tube, barrel and spare bolt on hand. Worst failure I've experienced as of late was a blown gas ring (rifle still functioned), and a double feed. I try to shoot 2 times amonth, at least 200 rounds per session. 11.5" pistol (no SBR here) for drills. 14.5 for longer range. The gas ring failure was under 3k rounds, but was a poverty pony (Anderson) rifle.....lesson learned, I run Colt now.
Sounds like the makings of a new rifle!
Early gas ring failure is often associated with a rough finish on the gas ring run portion of the bolt carrier bore.
The rough finish is technically "out of spec" and tends to show up in lower quality units.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
No. Both were on a 16" 5.56 AR different guys at different ranges had light strikes. I had my parts kit with and replaced both for a nominal fee and got them back up and running.
The knob end that goes into the gas key was worn beyond allowable limits. I've replaced one or two of mine and one or two of my brother's.The gas tube, how did that fail?
Yes. Yes, it did.And the bolt catch, did that fail at the same time as the roll pin?
The pivot pin hole in the bolt release was slightly over large. With use, the hole elongated and the roll pin started to shear. This was exacerbated by the mag release being not tightened enough (Mag release was on me. I was experimenting). Replaced the bolt release and roll pin and tightened the mag release. Hasn't been a problem since.What happened to it?
Last edited by MistWolf; 01-26-21 at 01:32.
The number of folks on my Full Of Shit list grows everyday
I am American
I think they do break, but I think the issue is the different levels of quality out there. I think any firing pin retaining pin from a reputable manufacturer/seller will rarely be a problem unless there is a problem with the gun.
Some people use regular cotter pins which I believe don't fit as well (because of a rounder head) and are not as strong (because some/all are not heat treated). I think this is where some of the reported problems come from.
I've never replaced a firing pin retaining pin, but keep some on hand in case I lose one when cleaning. But, I've never lost one either.
Joe Mamma
"Reliability above all else"
NRA Certified Pistol and Rifle Instructor, Life Member
Glock Certified Armorer
Beretta & Sig Sauer Certified Pistol Armorer
Colt Certified 1911 & AR-15/M16/M4 Law Enforcement Armorer
Any idea what kind of round count on those hammer springs?
And what was the round count on the gas tubes? I've always heard that those will outlast the barrel. Also, what did the gas keys look like? I'm assuming too much gas was escaping and you were getting short stroking?
No, don't expect this to resolve itself with use.
It is essentially a chrome plated file or rasp with surface harness over 60HRC.
Chrome is very wear resistant and gas rings don't stand a chance.
This is another example of the importance of starting with a quality BCG.
Black River Tactical
BRT OPTIMUM Hammer Forged Chrome Lined Barrels - 11.5", 12.5", 14.5", 16"
BRT EZTUNE Preset Gas Tubes - PISTOL, CAR, MID, RIFLE
BRT Bolt Carrier Groups M4A1, M16 CHROME
BRT Covert Comps 5.56, 6X, 7.62
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