rockyboy

All the marks came from taking shots or trying different parts. If I mill the front of the upper. Can't I shim it back? Yes there are. Two places. I can see the bolt camming over but know don't know if it's all the way. Plan now is to get some gauges. Then perhaps I'm going to try a bit of milling. Then sell it for scrap and dive into my 12Y/O+ scotch collection. I have tried numerous combinations of springs and weights. When I thought of bolt bounce it was when I tapped the BCG forward and it fired. It won't do this anymore. Thanks guys. These are the areas I'm considering milling. The blue marker seems to be from the shoulder of the BCG. But is this not allowing the cam to fully engage? The yellow is because I took a BCG with bolt and pin and put a case with only the primer in it. Then I put this into the barrel. When I tapped the FP it fired. After three BCG's, bolts and pins. Four different buffer springs and as many weights. All of these in as many combinations as I can figure and it seems to only work without the upper? The green arrow? I have no idea.

Yes there are. Two places. I can see the bolt camming over but know don't know if it's all the way. Plan now is to get some gauges. Then perhaps I'm going to try a bit of milling. Then sell it for scrap and dive into my 12Y/O+ scotch collection. I have tried numerous combinations of springs and weights. When I thought of bolt bounce it was when I tapped the BCG forward and it fired. It won't do this anymore. Thanks guys. These are the areas I'm considering milling. The blue marker seems to be from the shoulder of the BCG. But is this not allowing the cam to fully engage? The yellow is because I took a BCG with bolt and pin and put a case with only the primer in it. Then I put this into the barrel. When I tapped the FP it fired. After three BCG's, bolts and pins. Four different buffer springs and as many weights. All of these in as many combinations as I can figure and it seems to only work without the upper? The green arrow? I have no idea.

Yes there are. Two places. I can see the bolt camming over but know don't know if it's all the way. Plan now is to get some gauges. Then perhaps I'm going to try a bit of milling. Then sell it for scrap and dive into my 12Y/O+ scotch collection. I have tried numerous combinations of springs and weights. When I thought of bolt bounce it was when I tapped the BCG forward and it fired. It won't do this anymore. Thanks guys.

Hey guys thanks for info. Here's where I am. But first, everything is clean as far as all the parts in the upper and lower. This is a new build and has less than 15 rounds through it. I've changed each part on the build with a working Black Rain. With no results. Yesterday I wondered about something I'd read years ago, bolt bounce. Placed a empty round with only a primer. Put in an empty mag. Locked the bolt back and then let it go by the release. Nothing. So I tried pulling the bolt back until I thought it was enough to just put the bolt into battery. Pulled the trigger and "BANG!" My guess is that I've got way to much forward energy and now have bolt bounce? Plan is to try different springs and weights. Yes?

Yeah, I thought about the trigger. "A heavier hammer" as one friend suggested. I've tried three different triggers. Two are pretty darn nice. Or cost enough to be. Anyway, Thanks for the brain effort. I really appreciate you spending a bit of time with my problem. But no foreign objects in or around the trigger. It's like the triggers need to "go more forward". I just don't get it. But when I put that patch of duct tape on the end of the FP, it worked.

I changed out the FP with the one from BR. No good, then I butchered one by putting it on my lathe and re-cutting it just to see if a longer pin made any changes. I seriously doubt this is an acceptable method of gunsmithing. It is "slightly" longer than the BR's FP and still does not work.

Thanks, This all makes sense. Right now I'm just trying to set off a primer. This gun did shoot. Now this. I'm putting a factory loaded cartridge that I've pulled apart for shell and primer only. Manually putting charging the gun and seeing if the primer goes off. I did try different springs and weights and got the same response. However, to say thanks, I do lathe and mill work. I would be happy to make you would like a series of spacers made of 6k or 7k grade aluminum, I'd be happy to send you a few on me. I'd make them fit the buffer on one end and accept the spring on the other. Size's per your request. I think once I get the gun to shoot again, I'll need to re-visit your thinking.

Thanks, That BCG of black rain just stops right there. I was lathing up some spacers for the buffer tube in some 6000 grade aluminum when people smarter than I said stop that. I built around 15? AR15's so I mistakenly thought I knew something about 10's. Haha.

First, Thanks guys. I put the build of this gun in the wrong place. Sorry. Now that it's doing something different, I hope it's ok to start a new thread. I've attached pic's of the puzzle. I was having feeding issues when You folks help me with a different buffer spring and weight as well as an adjustable gas block. This was exciting to watch the feeding as I adjusted the gas block. I started from almost closed and slowly opened it. Then I started to get really light primer strikes. I've switched out parts from a Black Rain one by one. Different, trigger for a heavier hit, buffer spring then weight. Bolt and pin. The only part that will not change out is the BC. In one of the pics you can see a sliver nick where the black rain's BC hits the green upper. The last thing I tried was to put a patch of duct tape on the end of the pin. It worked just great. I doubt this fix is in the Gunsmith's Handbook of Acceptable Repairs. If you have a moment, I'd sure like for you to look at the pics and/or have an idea of what's happening, or not happening. I also tried the black rain pin. It also required the "duct tape" fix. Thanks for your time.

Sorry about delay. I took my black rain lower and pulled a few rounds of .308 from different company's . The black rain set off the primers. So I'm thinking trigger spring? It's a geisselle 2 stage

Hey guys, Building several AR15's gave me the bad idea that an AR10 would be simple. The thing worked up to the third shot. Here a round would not strip off and go into battery. Thinking it was over gassed I put an adjustable gas block on it. This was actually kind of fun to watch and see how more gas was helping the gun cycle. Then it would pick up a round and just softly dimple the primer. Now I have to use the charging handle as the gun won't cycle or fire. When it picked up a second or third round I never noticed if it was locking back. Because it jammed prior to an empty mag.