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Posted: 5/31/2016 10:04:04 AM EDT
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BCG A works perfectly in Upper A and B.
BCG B works in Upper A. Very slightly tighter than BCG A. BCG B sticks in Upper B. BCG B problem description. by hand with no charging handle the bolt carrier is hard to push in and not possible to pull back out by hand have to hammer it out. With charging handle and plenty of lube it will cycle if I release the CH at full extension and let the carrier slam back with full spring tension. If I hold on the CH and ease the carrier back in to place it gets stuck about 1.5 inches away from the feed ramp. Can't quite tell what it's sticking on. It is NOT an air tube problem. BCG B seems to be getting loosened up in Upper B with multiple cycles but this could be due to optimism. Upon pulling charging handle back it comes back about 3/8" and gets stuck here. If I pull the charging handle back very hard with 2 fingers it will get unstuck. Upper B is brand new aero. BCG B is a "test fired" EE Spikes. Suggeations? Thanks |
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Quoted:
BCG A works perfectly in Upper A and B. BCG B works in Upper A. Very slightly tighter than BCG A. BCG B sticks in Upper B. BCG B problem description. by hand with no charging handle the bolt carrier is hard to push in and not possible to pull back out by hand have to hammer it out. With charging handle and plenty of lube it will cycle if I release the CH at full extension and let the carrier slam back with full spring tension. If I hold on the CH and ease the carrier back in to place it gets stuck about 1.5 inches away from the feed ramp. Can't quite tell what it's sticking on. It is NOT an air tube problem. BCG B seems to be getting loosened up in Upper B with multiple cycles but this could be due to optimism. Upon pulling charging handle back it comes back about 3/8" and gets stuck here. If I pull the charging handle back very hard with 2 fingers it will get unstuck. Upper B is brand new aero. BCG B is a "test fired" EE Spikes. Suggeations? Thanks Sounds normal to me. The BCG is sticking on the hammer. It's a machine it needs lubrication. It needs to be broken in. Shoot it and see what happens. If you are using froglube, use real oil. |
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I suppose I should also mention upper A is.223 wylde upper B is .300blk. Am I wrong to assume that shouldn't matter? What type of gas block does the .300 upper have on it, if adjustable, open it all the way up and then try, on my .300 had to put an adjustable on it and open it up, over gas, then tune it again after I got it running reliably. |
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No. Having a A upper in 223 and upper B being a 300 BLK out is not going to change things. Upper B just seems to be a little tighter as you describe. Also as stated above,
when Upper B is on a lower and you charge it, remember the BCG bottom is going to slide over the face of the Hammer while pushing the hammer back down as you probably already know. But if Upper B is off of a lower and you have a hard time sliding BCG back and forth in the upper then the upper might be a little out of spec. Lube the shit out of it and cycle it a lot. I have read where some people on here have cycled theres 100 times before even shooting it. Or you can just lube it and shoot it and break it in that way. But then again the spikes BCG might be a little out of spec. |
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What type of gas block does the .300 upper have on it, if adjustable, open it all the way up and then try, on my .300 had to put an adjustable on it and open it up, over gas, then tune it again after I got it running reliably. Quoted:
Quoted:
I suppose I should also mention upper A is.223 wylde upper B is .300blk. Am I wrong to assume that shouldn't matter? What type of gas block does the .300 upper have on it, if adjustable, open it all the way up and then try, on my .300 had to put an adjustable on it and open it up, over gas, then tune it again after I got it running reliably. nothing to do with gas block. the parts are new and need to be broken in. these are basically new unfired parts from what I read in the original post. well, the BCG is "test fired". |
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nothing to do with gas block. the parts are new and need to be broken in. these are basically new unfired parts from what I read in the original post. well, the BCG is "test fired". Quoted:
Quoted:
Quoted:
I suppose I should also mention upper A is.223 wylde upper B is .300blk. Am I wrong to assume that shouldn't matter? What type of gas block does the .300 upper have on it, if adjustable, open it all the way up and then try, on my .300 had to put an adjustable on it and open it up, over gas, then tune it again after I got it running reliably. nothing to do with gas block. the parts are new and need to be broken in. these are basically new unfired parts from what I read in the original post. well, the BCG is "test fired". Well I beg to differ, which is the reason I asked the question, I was exploring something that happened on one of my builds. And as I posted, also lube it good and shoot it so things can break in. |
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seems silly, but check to see if the CAM PINS are interchangeable between the two BCGs..
I've had similar issues and it turned out the cam pin was the culprit on the "tight BCG" (I dont remember how I figured it out but I had to run a standard cam pin on an otherwise fully NiBx coated BCG) |
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seems silly, but check to see if the CAM PINS are interchangeable between the two BCGs.. I've had similar issues and it turned out the cam pin was the culprit on the "tight BCG" (I dont remember how I figured it out but I had to run a standard cam pin on an otherwise fully NiBx coated BCG) I have another thread going about problems with NiB BCGs. This is an example, it sounds like, of the coating adding to much thickness to the parts to the point the bind. I've NEVER had any issues with regular parked BCGs. Since I got into NiB BCGs I've had a gas tube that wouldn't even fit into the gas key, another that required a lot of force to even fit into the upper (seems to be tightest in the middle of the receiver). I'm still having reliability issues with both of those, they seem to be breaking in, but honestly I've always be able to just drop in a parked BCG, bumpfire a couple mags trouble free and then trust the rifle with my life. No more NiB for me. |
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I have another thread going about problems with NiB BCGs. This is an example, it sounds like, of the coating adding to much thickness to the parts to the point the bind. I've NEVER had any issues with regular parked BCGs. Since I got into NiB BCGs I've had a gas tube that wouldn't even fit into the gas key, another that required a lot of force to even fit into the upper (seems to be tightest in the middle of the receiver). I'm still having reliability issues with both of those, they seem to be breaking in, but honestly I've always be able to just drop in a parked BCG, bumpfire a couple mags trouble free and then trust the rifle with my life. No more NiB for me. Quoted:
Quoted:
seems silly, but check to see if the CAM PINS are interchangeable between the two BCGs.. I've had similar issues and it turned out the cam pin was the culprit on the "tight BCG" (I dont remember how I figured it out but I had to run a standard cam pin on an otherwise fully NiBx coated BCG) I have another thread going about problems with NiB BCGs. This is an example, it sounds like, of the coating adding to much thickness to the parts to the point the bind. I've NEVER had any issues with regular parked BCGs. Since I got into NiB BCGs I've had a gas tube that wouldn't even fit into the gas key, another that required a lot of force to even fit into the upper (seems to be tightest in the middle of the receiver). I'm still having reliability issues with both of those, they seem to be breaking in, but honestly I've always be able to just drop in a parked BCG, bumpfire a couple mags trouble free and then trust the rifle with my life. No more NiB for me. BCG A is NiB WMD BCG B is Black Spikes |
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Quoted:
seems silly, but check to see if the CAM PINS are interchangeable between the two BCGs.. I've had similar issues and it turned out the cam pin was the culprit on the "tight BCG" (I dont remember how I figured it out but I had to run a standard cam pin on an otherwise fully NiBx coated BCG) Cam pin clearance in the uppers is where I was being lead to. If the heads on the cam pins are of differing shapes and/or sizes the second pin may not clear where the first does. You should see a cutout in the top of the upper for this, but often it won't accommodate all pins. Based on where in the stroke you are saying this is happening just adds to my thinking this is the problem. By shooting it, or hand-cycling it a LOT it will break in and the problem will go away. |
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