AR Build

[MikeTastic]

Wasn't sure where to post this. Sorry if it not in the right spot.

I'm wanting to build an at, but before I do, I have a question that I want to ask.

Ok, so are stripped lower receivers caliber specific or can you just buy any lower and build it to the cal you want to use?

 

[sithlord]

Wasn't sure where to post this. Sorry if it not in the right spot.

I'm wanting to build an at, but before I do, I have a question that I want to ask.

Ok, so are stripped lower receivers caliber specific or can you just buy any lower and build it to the cal you want to use?

Since the barrel and bolt carrier group are in the upper receiver, and any AR-15 MIL SPEC upper receiver will mate with any AR-15 MIL SPEC lower receiver, you are good to go.

The only difference with a stripped lower is that you need to add the Fire Control Group, stock, etc. If it's an 80% lower, then you need to mill out the other 20%.

The FCG is not specific to any caliber, although you may get light or heavy hammer strikes. The buffer may also need to be changed depending on the caliber.

HTH...

 

[thecatch8]

Wasn't sure where to post this. Sorry if it not in the right spot.

I'm wanting to build an at, but before I do, I have a question that I want to ask.

Ok, so are stripped lower receivers caliber specific or can you just buy any lower and build it to the cal you want to use?

At?...........

 

[sithlord]

At?...........

Being rather pedantic today, huh? T and R are right next to each other on the keyboard, and he got the title correct... Or maybe, I suppose, he's going to build a Star Wars AT (either the AT AT or AT ST) with mounted S&W firearms!

 

[Rastoff]

The AR lower is not caliber specific. However, there are some calibers that require a larger magazine well. So, .223Rem, 5.56 NATO, .300BLK, 6.8SPC and some others will all use the standard AR-15 lower.

However, if you want to shoot 7.62x51 or .308Win (same round really), then you'll need an AR-10 lower.

 

[sgtsandman]

I will add to Rastoff's list. 458SOCOM, 7.62X39, .45 Beowolf, there is a 6.5 round (can't remember the specific name), and a .30 caliber Remington round. The AR15 lower is quite versatile. It think there are one or two others but the ones Rastoff mentioned are them most common and generally the least expensive rounds to shoot and reload. Ones like the 458SOCOM can be quite spendy because they aren't very common. I don't think I've seen any 7.62X39 that could be reloaded.

 

[Desert Five-0]

There are a bunch of calibers out there, but if you don't already have a 5.56/.223 start there. Some of the other calibers have slight to major function problems in some guns and other calibers cost too much to shoot regularly. 5.56/.223 is relatively cheap however effective for practice and or self defense.

Other options:
.22 lr
.9mm
.40 s&w
.45 acp
5.7x28
.300 blackout
7.62x39
4.54x39
6.5 Grendel
6.8 SPC
.450 Bushmaster
.458 Socom
.50 Beowulf
410 shotgun

Then there are bolt action uppers for large rifle rounds like.50 BMG and .338 Laupa

 

[Argonnakid]

The .50 Beowolf is another caliber and don't forgot the pistol caliber's, mostly 9mm. A great place for info is youtube. I am a visual person myself and found that the different ways others went about their builds helped me to create my own way. Good luck with your build. I really enjoyed building mine, and the best thing about it is that it is my rifle. I chose all the parts to my needs and wants.

 

[sgtsandman]

I stand corrected on the Beowolf. I should have said 50 instead of 45.

 

[vipermd]

You could go with a MGI Hydra ( mark 15 ) that is modular and includes : 22lr,9mm,45 acp,223,7.62 x39, 7.62 X 51, 458 socom, 450 thumper, 6.8, 300 BLK all with the same receiver. Very slick, just got a new scope for the 300 Blk, need to mount and test for repeatability.. Be Safe,