AR-15 & AR-10 Compatibility: Uppers, Lowers, Bolts, & Barrels

Correction: ArmaLite AR-10 pattern has an angled profile; DPMS Gen-1 Low Profile and LR .308 rifles have rounded profiles as shown in the video

Can an ar15 a2 handguard be put on an ar308 upper?

I have AR 15 Anderson Lower and buying an Anderson 6.5 Grendel Upper. My Question is'; On that setup with 6.5 BCG and Magazine, it will shoot the Grendel but what's it take to fire 5.56 out of that setup? Could I just change to the AR 15 P- Mag and shoot the 5.56?

You didnt talk at all about the interchangeability of the lower parts kits

You're saying you can put a 308 on that ar15 lower?? Noo

ar10 your upper with aero m5 lower, won't mate up at the rear pin because of the blow back half moon looking screw. take that screw out, mate up is fine. what's the solution? thanks.

Can I put your 308 upper on a PSA PA-10 Gen 3 lower?

These are not "cheap" rifles..contrary to what you may hear. It's kind of wild these guys deliver such great products along with insight for such great prices..these are one of the best "value" rifles on the market.

On the rear charging ar10 upper, do they use a standard ar15 charging handle?

Will pa10 gen2 lower work with bca ar308

Hello, is your upper will fit aero precision M5 lower receiver? Thank you very much

Looking forward to the 20inch barrel for my gen 3 psa 😈

Hi, i was on your sales sight today i'm looking to get a 308 upper, the lower i currently have appears to be the same as the one you just shown in this video prior to going to the 5.56 lower, The thing that keeps throwing me off is i have has what i want to call a shelve top seat what i mean is i've seen some of these 308 lowers with straight walls in the area of the trigger but then i see some with the straight walls that L off at the top where the upper will sit ..I hope your understanding what i'm trying to translate, So in my minds eye i would see to types of uppers one that would sit flush with the walls that come straight up as seen on all or most AR 15 lowers then a upper that must be wider to sit on the L or shelve as i called it, I'm just using the 5.56 as a reference or example on the wall differences', So in short just to be clear although both maybe a AR-10 1st generation DPMS lowers but the side walls on one in the trigger area come straight up like one would find on an ar 15 then the others comes straight up then L channel out to the side This is throwing me off and stopping me from making a purchase, Thanks for reading this mess i hope you follow what im saying.

Do you guys still have the 24inch 308 upper ?

I just got the side charger 7.62 ×39 upper a few weeks ago and its perfect it looks like an 800.00 piece of premium tool steel, 237.00 and free shipping, and I have 1 of the lowers with the cool polishing on the way I'm going to hook up, this is the first time I've ever ordered a complete upper and I'm glad I got Bear Creek Arsenal, I'm going to set a Monstrum Gen 3 ffp 6×24×50, and just see how far I can hit a half sheet of sheet rock with it, lol thanks again

I have AR-15 Billet Lower Receivers from 80%Arms and 5DTactical…they are milspec compatible. Can I assume that your BCA complete upper receivers will be compatible with these lowers?

My Palomino State Armory lower fits your guys 243 Winchester that I bought

So did i get it right….your ar15 lowers support all of your uppers….so i could buy your lower and pair it with your .308 upper???

I just ordered a 16inch .50 Beowulf complete upper from you guys 2 days ago. I wanna know wanna know which buffer do I need? H1 or H2?

Wait. Isn’t the grendel and 7.62×39 the same bolt? I think the case is the same.

Also the thread pitch of the barrel nut is different between the Amalite (AR-10) and DPMS (LR-308), and there is a low profile and high profile upper rail height with DPMS. (This effects handguard compatibility) The main reason for all the wierdness is that the AR10 was never adopted by the US so there is no "Mil Spec" and it's not public domain-ish like the AR15 platform.

There are also "hybrid" receivers that fit to a Amalite lower but use DPMS barrel nut threads. And Amalite lower parts are not compatable with DPMS which use AR15 lower parts.

And to add to the confusion there's GEN II Armalite…

It's best to stay DPMS (LR308) High/Low profile and avoid the Armalite single parts source trap.

This is incorrect. The ar10 or armalite standard is the "squared" angle, vs lr308 is the dpms style rounded standard.

Nice !

Is a Juggernaut JT-10 lower compatible with a BCA AR-10 upper?