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Posted: 4/11/2012 4:42:44 PM EDT
| Long story short the gas block isn't lined up right and it is hitting offset on the barrel not causing the bolt to recoil. It still has a good amount of gas reaching the gas tube. My biggest question is why is this causing the bolt to not recoil? I mean hell there is at least 70% blow back hitting the gas port. The bolt will move about 1/2 inch and stop. So essentially I have a bolt action AR15 haha. My next question is what are the possibilities that the gas port in the barrel is not drilled dead center and the gas port will always be crooked? I'm just a little annoyed to be honest. The gas issue can be fixed but I kind of wanted to use the gas block rail for a bipod and if the gas port is drilled right or left the rail won't be centered. |
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I dont see how escaping gas from the block area can hit the bca.
You sure your refering to the right parts? If gas is escaping from the gas block area it would just vent out under the handguards or around the front sight area. What make upper? Some early cheaper uppers M1S and M&A were known to have canted front sight/gas blocks. It could be that those holes just need to be religned. |
| This is the issue haha. The holes in the gas block and the gas hole of the barrel are not properly aligned. I am having a hell of a time doing it also. It is a Blackthorne Upper. Yes I have found out they are not a very well liked brand. The upper and parts seem very good, just very poorly assembled. |
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This is the issue haha. The holes in the gas block and the gas hole of the barrel are not properly aligned. I am having a hell of a time doing it also. It is a Blackthorne Upper. Yes I have found out they are not a very well liked brand. The upper and parts seem very good, just very poorly assembled. Wow. That's crappy. |
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This is the issue haha. The holes in the gas block and the gas hole of the barrel are not properly aligned. I am having a hell of a time doing it also. It is a Blackthorne Upper. Yes I have found out they are not a very well liked brand. The upper and parts seem very good, just very poorly assembled. You get what you pay for. Enjoy |
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I'm slightly confused lol.
Have you tried reassembling it and shooting it? I would think a shit ton of the gas would need to be escaping in order for it to only push the bolt back an inch or so. Also the bolt stops locked back a half inch? Something is wrong there to. The buffer and recoil/buffer spring should force everything back into a forwRd position with the bolt locked into the extension...even if under gassed due to a leak in the system. U know what I mean? You should rip that whole thing apart and inspect everything then properly reassemble |
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This is the issue haha. The holes in the gas block and the gas hole of the barrel are not properly aligned. I am having a hell of a time doing it also. It is a Blackthorne Upper. Yes I have found out they are not a very well liked brand. The upper and parts seem very good, just very poorly assembled. You get what you pay for. Enjoy I love helpful responses in a tech forum. 
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This is the issue haha. The holes in the gas block and the gas hole of the barrel are not properly aligned. I am having a hell of a time doing it also. It is a Blackthorne Upper. Yes I have found out they are not a very well liked brand. The upper and parts seem very good, just very poorly assembled. You get what you pay for. Enjoy Hmm thank you for the input and not the criticism. Had a known bad of a product they produced I never would have bought it. I would further appreciate you do not attempt to provide me help or opinions on topics that you just wish to cop an attitude. |
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I'm slightly confused lol. Have you tried reassembling it and shooting it? I would think a shit ton of the gas would need to be escaping in order for it to only push the bolt back an inch or so. Also the bolt stops locked back a half inch? Something is wrong there to. The buffer and recoil/buffer spring should force everything back into a forwRd position with the bolt locked into the extension...even if under gassed due to a leak in the system. U know what I mean? You should rip that whole thing apart and inspect everything then properly reassemble I bought a Surplus Ammo and Arms stripped lower and a RRA A2 complete stock kit. I put them together with a DPMS lower kit and it worked perfect when I put it on my DPMS carbine upper. The only thing I changed was the buttstock. I left the original spring and buffer tube in the lower. |
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I'm slightly confused lol. Have you tried reassembling it and shooting it? I would think a shit ton of the gas would need to be escaping in order for it to only push the bolt back an inch or so. Also the bolt stops locked back a half inch? Something is wrong there to. The buffer and recoil/buffer spring should force everything back into a forwRd position with the bolt locked into the extension...even if under gassed due to a leak in the system. U know what I mean? You should rip that whole thing apart and inspect everything then properly reassemble I may be confused but if the gas is not forcing the bolt back far enough it wouldn't have the pressure to force the buffer/spring back correct? |
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Yes everything should be moving together. I was just pointing out that if the bca isnt returning to a closed/normal/forward position then there may be a prob somewhere else to.
If the upper ran fine on a diff lower you may look at the buffer/tube/spring and all that stuff to. Can you get pics of all this? |
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I'm slightly confused lol. Have you tried reassembling it and shooting it? I would think a shit ton of the gas would need to be escaping in order for it to only push the bolt back an inch or so. Also the bolt stops locked back a half inch? Something is wrong there to. The buffer and recoil/buffer spring should force everything back into a forwRd position with the bolt locked into the extension...even if under gassed due to a leak in the system. U know what I mean? You should rip that whole thing apart and inspect everything then properly reassemble I may be confused but if the gas is not forcing the bolt back far enough it wouldn't have the pressure to force the buffer/spring back correct? It has to push everything back. You should have mentioned that this was a Blackthorne at the start of the thread. We then would have taken turns whacking you upside the head and then maybe you'd have gotten better cooperation. Blackthorne is probably the worst AR brand on the entire planet and this gets mentioned often here. Since you bought a Blackthorne it's reasonable to assume that you're new to AR's. 1. See if you can return it. Tell them your wife won't let you in the house with it. If that won't work and you're OK with carrying the shame of owning a Blackthorne... 2. Take it to a competent, Black Rifle gunsmith and see if he can get it running. There are likely other issues. You must use a competent Black Rifle smith or you will be back here with more problems. |
| I'm actually not new to AR's. I have a DPMS Carbine I bought as a complete rifle 2 years back and just bought a few Del-Ton kits 2 months back. As most of you should know Del-Ton has no kits in stock and my knowledge of upper receivers and assembling them is little to none. I have built and assembled my last 2 lowers with no issue. I saw the kit of Blackthorne and figured for the price what the hell. Obviously this is the last time I order from them but I'm not returning it. I am already having their sorry excuse for a gas block being milled as we speak. I am not really disappointed with the barrel or the upper receiver, just how poorly it was assembled and how it seems they made no attempt to take a caliper or micrometer to make sure the gas ports were aligned. |
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I am already having their sorry excuse for a gas block being milled as we speak.. Not quite sure what is going on here. If it's an A-frame FSB (not enough info to know) and it's misaligned, you also have a "cant" problem which you will discover when you try to sight in. Good luck. |
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I am already having their sorry excuse for a gas block being milled as we speak.. Not quite sure what is going on here. If it's an A-frame FSB (not enough info to know) and it's misaligned, you also have a "cant" problem which you will discover when you try to sight in. Good luck. Well there is relatively no way for me to get it running. The hole drilled in the gun isn't straight and is drilled at an angle. I talked to a custom upper specialist who claims he can get it working. Thus far I need a new gas block, gas tube, gas port for my BCG and most likely custom milling and my barrel rotated on the upper to make the previously drilled has hole straight. Good part is that I was very clear on how bad the upper is and he claims he can get it running. Long story short I learned to do my research. |
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