pnutty

Good points on everything, the rods put the torquing stress on the steel barrel/extension instead of the aluminum upper receiver. I do have to ask, have you ever had the index pin slot deform or get damaged using the action rod method? I read some stories about that happening but they were with the smaller platform and not the larger platform.

That was an experience I bet, what is your suggested way of installing and removing barrels on these 308 uppers?

Perfect, thanks for all the help you’ve given me. With any luck the rest of the parts should be here by this weekend and I will do a range report. Just one other question, when installing the barrel nut on ar15’s I always clamped the barrel in a barrel vice and tightened the nut that way. With the larger 308 platform, would it be better to sandwich the top and bottom ends of the receiver in a vice and tighten the nut that way?

I am building on a aero m5 receiver kit with a BA 6.5cm barrel, a local gun shop is selling DPMS 308 bcg for a good price. Is it required to have the “high pressure” dual ejector bolt with smaller firing pin for the 6.5cm round or would I be ok with the 308 bcg?

Great! I did fire off an email to them last night and they spec’d the port diameter to .0785.

That good to hear, so no primer flow or whatever they call it into the firing pin channel? That was my main concern and it binding up the bcg.

The more I visit this site, the lighter my wallet gets🤣

I will look into battle arms development, thanks for the source of those parts. My main question now is about the bolt carrier group, is the 6.5 dual ejector bolt with reduced firing pin a necessity and would you have any suggestions on brands to purchase/avoid? I see that toolcraft makes most of them which could simplify what I get. One last question would be what size gas port should this barrel have? Its a 20” with rifle gas system and .875 journal, I would rather open it up when it’s apart than test and find out it’s too small and has to be opened up later.

Thank you for responding, I checked Aero’s website and it did indeed say dpms high tang (.210) for the m5 upper. For the lower parts kit, besides replacing the trigger and grip, what else could I do? I read that few other manufacturers fit aero lowers as they kept some things different.

Hello everyone, I am finishing a Aero m5 build and just wanted to see if there would be any issues with the parts combination I chose. I would rather buy the correct parts now than have issues and rebuy new parts later on… I have read that the Armalite buffer setup is the best for this kind of platform but unfortunately could only find the buffer spring so I tried to recreate the rest of it with other parts. The rifle is a 6.5 Creedmoor build that will be reloaded for with H4350 and srp brass; Aero M5 upper and lower CMMG 308 LPK UTG pro 308 carbine buffer tube, internal length measure at 7-11/16 deep EA1095 buffer spring H3 buffer (was actually listed at 5.6oz but do not have on hand to measure) BA premium heavy barrel 20” length with rifle gas system Aero low pro gas block Aimsports 15” DPMS high handguard mlok I have not chosen a bcg yet, I would like others opinions before doing so. My only question is whether a 6.5 bolt is need and if the dual ejector setup will ruin brass. Thanks in advance for everyone’s advice.

Hi everyone, new to the 308ar world. A bit of backstory on myself is that I bought a m5 lower right before covid and then life happened, years later going through the safe I found it in the original box and figured it was time to finish it. I start researching for parts and come to find out that Aero no longer makes parts or the company is shut down, so here I am thinking I have nothing more than a paperweight now. Luckily a friend turned me onto a local shop I never heard of but I give it a shot, low and behold he actually has a m5 upper hiding away somewhere in the shop and even though it's a different color than the lower, I am still ecstatic to at least have a matching receiver set. After getting that sorted, I set out to actually finish this build but had many questions as their is no milspec/standardization compared to the ar15. I happened across this site while researching and realized and their is a TON of knowledge here, with very helpful members so I joined. Hopefully after a few years of sticking around and learning I can start helping other members as well.