One more question then I will shut my hole for awhile.
I purchased a Aero precision complete lower in the M4E1 configuration. Registered as a lower receiver and is stamped as multi cal.
This lower came with a h3 carbine buffer tube and I bought a brace to fit it.
I purchased a 300BO complete upper from PSA that came with a 7" barrel. After I bought it, I decided
I wanted a longer barrel so I bought a Bear creek arsenal 10.5" heavy barrel to install after my tools arrive to swap it out with. I'm concerned about over gassing my buffer with the pistol length gas block. Should I need to get a pistol buffer tube and then have to buy another brace to fit it? My wife aint real pleased with my money spending so I want to do what is necessary but I do not want to waste money if I do not need to. Thanks in advance for advice.
Sharps4590
Laughed so hard at this that I almost chipped a tooth on the coffee mug.
I did, though, spray the laptop with a goodly portion of Maxwell House.
If you stand by for a little while longer, I am sure you will get a real answer to your question. We do have some members that seem to really know their stuff when it comes to ARs.
I am in no rush, not even going to put a round through the 7". Still waiting on my barrel nut grease and AR tools, with vice block coming in the mail, Now THAT I am getting impatient on. Then going to take it to my gun smith to check head spacing for assurance all is good. Did not want to spend $100 for something I only need once. Thanks though.
I did not realize they cost so much! I bought mine so long ago that I don't even remember what I paid and besides, I haven't seen them is some time now. I guess what I am trying to say is that you don't really need to headspace an AR!
300BO is a kinda new caliber (2011) at least to me. If I need to go to a 5.56 at least I will be able to swap barrels and go. Then I probably would not worry about the factory having a head spacing issue.
I understand, my smith will double check it for free and he lives 15 minutes away. I read online of a couple people that did run into a problem and I believe what your saying. It is just a safety thing that I don't feel will hurt. I appreciate your help.
That's great! I can always switch to 5.56 if I decide I do not like it. Same BCG, same magazines, same capacity, only a barrel swap. Many people do like it. I guess I will find out. How about the over gassing? The buffer?
I never experienced any "over gassing" that I know of, I actually don't even know what that means. When I built it, I bought a standard collapsible carbine buttstock with whatever buffer and spring that it came with.
I thought when you said "built" I assumed you assembled all the parts from a stripped receiver. Putting a assembled lower with a assembled upper together is just what I did. But I do not classify that as me building it. I just put the 2 parts together. Just a misunderstanding.
When an AR is over gassed the bolt speed increases and this can cause rounds to not be picked up or the bolt not locking back on an empty magazine. It can also effect how well the gun ejects the spent rounds. Both of these problems are problems with reliability.
I bought part kits and separate parts from all over the place and built the guns from nothing. In two cases, I built the lower (from nothing) and slapped a complete upper receiver on them.
I completed two 80% lowers, an AR-15 and an AR-9 glock mag lower. Now I need to build or buy two uppers. Still trying to figure out what caliber to run on the AR-15. 9mm uppers and parts are hard to find.
I will be "building" my next AR but that is neither here nor there. I'm just hoping that those who know what over gassing is can help let me know if I need a different buffer or not. I can finish the project and just shoot it to find out first hand if I am over gassed or not. I am one who would like to do this project right the first time and have a "flawless" first time at the range with it. That's all, thanks for your help.
I think @zant could shed a lot of light on the question, it seems that he knows a great deal about the workings of AR's!! Hopefully he will show up and add his comments.
Just put it together....A 10.5 is superior in all aspects in .300Wh...if this is a supersonic only-yes a H3 buffer with normal spring and pistol gas tube are the correct pieces to start with...My 10.5 PDW runs a Geiselle G42 spring with a H2(G spring is STIFF),it operates flawlessly with supers......it will not cycle subs..I have 7.5/8.5/10.5/16" uppers for experimenting and have basically thrown 7.5/8.5 uppers in the back of room-they suck.
I have headspace guages-have put together about 30 uppers and never needed them-every one was well in spec.
Wow thanks zant, I will go with what I have as I will be reloading only super sonic anyway. The box of sub sonic, I will self cycle until I have the brass to reload. Ok, I will save my time on getting the head spacing check. You don't know my "luck" but I will do it anyway. LOL! Thanks man.
A down and dirty non technical way to check headspace-hold upper up level-push back of BCG until it's locked into lugs-the BCG will be even with rear of upper....if it sticks out or goes in-then use HS guage...
It seems that parts are getting harder to come by and when they are found, they are not affordable any more. If I was going to build another one, it would probably be another 7.62X39.
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