Former 11H

That’s so cool. I haven’t seen or thought of speed racer since I was a kid! Glad to hear more positive feedback on the heavy buffer. I will definitely go with that. Does it require the 6” tube? Does anyone have advise as to gas block initial setting? Thanks

Ok, I’m back. I think this will be an abbreviated version of what was lost. I can always post more later. I will order the recommended buffer and spring. Money is getting tight. I’ve already dropped $1,350 into this and expect to spend another $650 just to get the buffer system, furniture, and the Sig QD taper-look muzzle brake on it. That includes the small router and mag well vise block. I have a big router but it’s not compatible with the lower milling jig. What’s one more tool, right? On Aero Precision’s website, I only found one gas tube that fits the M5 upper in .308 that is rifle length. It states the buffer length is 6”. Can I use a shorter one or is that the one to go with? The 16” barrel has a gas port of .0730” Can you advise on how to adjust the gas block? Thanks guys, I’m getting there.

Hi Admin, I don’t see the last posting I made. Is it possible to type something and after submitting reply, have it go poof, into thin air? Or perhaps I lost it before hitting submit, or maybe I just completely forgot to hit submit reply. 😞

Wow. Thank you for that very thorough explanation. It seems as though I have a choice to make between hoping to get it to cycle on subsonic combined with hard recoil on supersonic, or accepting manual cycling on subsonic and reasonable recoil on super. That’s an easy choice for me to make. My first priority is to reduce felt recoil as much as possible due to recent major shoulder surgery that will only bring it’s functionality back to 80% of what it once was, when finally healed this Fall. I have to prevent further damage to it. This build will take the place of my bolt action.308 deer rifle. There really are people that need an AR for hunting. 🙂 Another reason for taking this route is that I have already bought pretty much everything but the buffer assembly, as far as functionality is concerned. I’d hate to have to shelve most of that and start this expensive endeavor from the drawing board. So, with all of that in mind, how would you recommend I reduce the felt recoil as much as possible without sacrificing reliability when shooting supersonic? This rifle will also be on hand for defensive purposes. What would you suggest for the buffer kit? Thanks again, Jeff

All good advise. I’d love to hear from Matt Cross too. Thanks

Thanks guys for the quick replies. This build will be a .308 What better place to seek advise than forum.308! i do not expect to be doing rapid fire but was thinking more about a rapid follow up shot and having that wisp of smoke curling up towards my face and scope. I haven’t actually fired my 300blk suppressed since last summer, so I may be over thinking the charging handle bit. A dab of high temp RTV in the crescent seems like a great and simple solution. I have seen subsonic in .308 online. I’m not sure why I’m concerned about switching between super and sub, suppressed and unsuppressed. My 300 blk doesn’t care one bit and cycles fine. Still, I’d like to know if anyone has had issues in the tuning stage and what they did. That answered my third question. Two more to go. Thanks again

If this isn’t the right way to ask others for advise, please tell me. I’m happy to follow your protocol. I’m in the process of gathering parts for this AR .308 build and would like help in choosing and sourcing a few components. One of the reasons for this build is that I had major shoulder surgery in December, right side of course, and I would prefer an AR platform to replace my bolt action 308 deer rifle and hopefully have less felt recoil. I also want one with more oomph and a straighter trajectory than my 300 blk. I am starting with a stripped lower from 80% arms, a stripped M5 upper from Aero Precision, 16” barrel, BCG, low profile adjustable gas block .750, melonite gas tube, and upper parts kit, extended mag release button, all from Aero Precision. Lower parts kit and fire control group from 80% Arms. I’m waiting for the jig from 5D Tactical, and if that doesn’t come before the changes in definitions by that three letter agency, I’ll buy a serialized lower from AP. My first question is, can I run both super and subsonic ammo and sometimes put my Sig TI 7.62 QD can on it, and have it run reliably? Second question, do need an adjustable buffer assembly? I know nothing about spring tensions and buffer weights, lengths etc. Third question, has anyone used vented charging handles for running suppressed? Are they a gimmick or is it worthwhile getting one? I haven’t ordered a barrel shroud yet. The one I want is back ordered at AP. Nor have I chosen a stock, although I’d like a collapsible one with an adjustable cheek pad. I started this with the intention of getting just enough components to make sure I could build this once the changes have gone into effect. I figured, over time I’d buy more parts as I could afford them, but I’ve gotten carried away, as you do, with any new exciting project. Thanks for any help you guys can give me, and again, I really hope this is the right way to ask for help.