Post by skinnyb82 on Jul 7, 2013 11:07:12 GMT -8
Got a little issue well more like a BIG problem, looking for a bit of help here because I'm stumped and I've asked for any help on another forum (specific to my state) and I get "it's either ammo or headspace or...I dunno man." When in doubt, ask the experts 
I built my .264LBC Type II (18" ML) a while back (got the barrel in May, think), I've got a Tactical Ammunition .264LBC Type II bolt in a YM chromed BCG, MI low-pro gas block. I bought 10 boxes of Wolf 6.5mm Grendel 120 gr. MPT ammo from AIM Surplus a while back, didn't wanna use hand loads for "testing" and getting Hornady ammo is like finding a unicorn and a Bigfoot, at the same time. So here we go.
I just took it out to break in the barrel last week. I popped a mag in (dunno if it was AR Stoner or ASC or C Products, I've just been ordering what's available), holy Mother of God what a mess. Did the old "pull the charging handle back as far as I can, let go" and the bolt failed to lock into battery, charging handle went slack, I believe I just smacked the charging handle and the bolt locked into battery. Fired a round, that's when all hell broke loose; it fired, chambered or tried to chamber another round but the bolt didn't eject the spent casing. The rim on the spent casing was stuck on the extractor claw, the neck of the spent casing looked like it had been crimped (more like crushed) by some needle nose pliers in about a dozen different directions, finally got the spent casing out and it had signs of ejector smear, shearing, and extractor pulling. So I went to see if it was undergassed, put a round in the mag, fired it, BCG locked back, spent casings (did it three times) either got stuck on the extractor claw, ended up backward sitting on the mag follower, ejecting (sort of) and just sitting on the follower. I tried two differet mags, one had an ASC followed. I guess the ejector shearing, smearing, extractor pulling are all signs of overgassing (which doesn't make sense since I checked the gas system). No blown out primers.
I tried another BCG, from my 5.56 which works flawlessly, didn't fire it but experienced the same failure to lock into battery issue. I cleaned the barrel thoroughly, cleaned the chamber, feed ramps with a brass brush because the chamber and feed ramps were full of brass shavings and all kinds of crap. Lubricated the BCG, replaced the extractor and extractor spring on the .264 bolt, replaced the ejector and spring (BEFORE I tried the other BCG), no dice. Still failure to lock. I can hand chamber a round, but even if I try to cycle rounds manually, the rims get stuck on the extractor claw. When I cleaned the barrel, I had to use (not even kidding) two dozen patches and they were just covered with carbon fouling. That didn't even clean it entirely so I use a .22 rifle bore mop and went to town on the barrel, thing came out pitch black, coal miner at midnight black. I can't believe I only fired five rounds and it was fouled exponentially worse than my 5.56/.223 after 200 rounds.
Just to rule, like, everything out. I function checked the FCG, no issues. The bolt locks into battery if there's no ammo. I can manually push a round into the chamber. I've tried three different mags, nada. The gas tube IS aligned with the gas key (I checked that one). Checked the gas system by plugging the muzzle, blowing compressed air into the gas tube and seeing if I get blockback, yup. Vice versa, plugged the breech, got airflow out of the muzzle.
I had a cheap DSA buffer tube and spring in there, Spike's ST-T2 (H2) buffer, I had the buffer tube screwed in too tight and the buffer was banging against the detent and...yeah it wasn't pretty so I actually replaced the detent, buffer tube, buffer spring. Backed off the tube off so it holds down the detent and that's it. Nope. No luck, failure to lock. After basically rebuilding the buffer assembly and the bolt itself sans gas rings, I've narrowed it down to either ammo or headspace, but leaning toward headspace. Oh, and even when I did fire it, I have no idea where the rounds ended up since I bore sighted the rifle, got a approx zero for the scope (sitting on my front porch at night, bouncing a laser off my neighbor's license plate, about 65 yds), but not a single round on target at 50 yds (I compensated for elevation). Overpressurized ammo? Bill Alexander said that Wolf had put out a bad batch, but the fact....ah look at the pics on the bottom. I ordered a PTG no-go gauge, we'll see.
ANY help would be appreciated as this is driving me NUTS. Thanks.
Spent casing just sitting on top of the follower (YM Chromed BCG)
Live round, extractor claw stuck on the case rim, ejector clearly not ejecting, extractor clearly not working (YM Chromed BCG)
Tried my Spike's Tactical M16 BCG, manually cycle a round, got this instead. Extractor won't let go of the round, ejector spring problem or does extractor need an O ring?
I built my .264LBC Type II (18" ML) a while back (got the barrel in May, think), I've got a Tactical Ammunition .264LBC Type II bolt in a YM chromed BCG, MI low-pro gas block. I bought 10 boxes of Wolf 6.5mm Grendel 120 gr. MPT ammo from AIM Surplus a while back, didn't wanna use hand loads for "testing" and getting Hornady ammo is like finding a unicorn and a Bigfoot, at the same time. So here we go.
I just took it out to break in the barrel last week. I popped a mag in (dunno if it was AR Stoner or ASC or C Products, I've just been ordering what's available), holy Mother of God what a mess. Did the old "pull the charging handle back as far as I can, let go" and the bolt failed to lock into battery, charging handle went slack, I believe I just smacked the charging handle and the bolt locked into battery. Fired a round, that's when all hell broke loose; it fired, chambered or tried to chamber another round but the bolt didn't eject the spent casing. The rim on the spent casing was stuck on the extractor claw, the neck of the spent casing looked like it had been crimped (more like crushed) by some needle nose pliers in about a dozen different directions, finally got the spent casing out and it had signs of ejector smear, shearing, and extractor pulling. So I went to see if it was undergassed, put a round in the mag, fired it, BCG locked back, spent casings (did it three times) either got stuck on the extractor claw, ended up backward sitting on the mag follower, ejecting (sort of) and just sitting on the follower. I tried two differet mags, one had an ASC followed. I guess the ejector shearing, smearing, extractor pulling are all signs of overgassing (which doesn't make sense since I checked the gas system). No blown out primers.
I tried another BCG, from my 5.56 which works flawlessly, didn't fire it but experienced the same failure to lock into battery issue. I cleaned the barrel thoroughly, cleaned the chamber, feed ramps with a brass brush because the chamber and feed ramps were full of brass shavings and all kinds of crap. Lubricated the BCG, replaced the extractor and extractor spring on the .264 bolt, replaced the ejector and spring (BEFORE I tried the other BCG), no dice. Still failure to lock. I can hand chamber a round, but even if I try to cycle rounds manually, the rims get stuck on the extractor claw. When I cleaned the barrel, I had to use (not even kidding) two dozen patches and they were just covered with carbon fouling. That didn't even clean it entirely so I use a .22 rifle bore mop and went to town on the barrel, thing came out pitch black, coal miner at midnight black. I can't believe I only fired five rounds and it was fouled exponentially worse than my 5.56/.223 after 200 rounds.
Just to rule, like, everything out. I function checked the FCG, no issues. The bolt locks into battery if there's no ammo. I can manually push a round into the chamber. I've tried three different mags, nada. The gas tube IS aligned with the gas key (I checked that one). Checked the gas system by plugging the muzzle, blowing compressed air into the gas tube and seeing if I get blockback, yup. Vice versa, plugged the breech, got airflow out of the muzzle.
I had a cheap DSA buffer tube and spring in there, Spike's ST-T2 (H2) buffer, I had the buffer tube screwed in too tight and the buffer was banging against the detent and...yeah it wasn't pretty so I actually replaced the detent, buffer tube, buffer spring. Backed off the tube off so it holds down the detent and that's it. Nope. No luck, failure to lock. After basically rebuilding the buffer assembly and the bolt itself sans gas rings, I've narrowed it down to either ammo or headspace, but leaning toward headspace. Oh, and even when I did fire it, I have no idea where the rounds ended up since I bore sighted the rifle, got a approx zero for the scope (sitting on my front porch at night, bouncing a laser off my neighbor's license plate, about 65 yds), but not a single round on target at 50 yds (I compensated for elevation). Overpressurized ammo? Bill Alexander said that Wolf had put out a bad batch, but the fact....ah look at the pics on the bottom. I ordered a PTG no-go gauge, we'll see.
ANY help would be appreciated as this is driving me NUTS. Thanks.
Spent casing just sitting on top of the follower (YM Chromed BCG)
Live round, extractor claw stuck on the case rim, ejector clearly not ejecting, extractor clearly not working (YM Chromed BCG)
Tried my Spike's Tactical M16 BCG, manually cycle a round, got this instead. Extractor won't let go of the round, ejector spring problem or does extractor need an O ring?
