Compatability Issues for DPMS .308

[Edditty]

Hello all, I'm still trying to order all the parts I need to build this DPMS LR308 and I'm running into some issues with compatability, or at least none of the local dealers are really sure of what will fit with what. Here's a list of what I have on order and what I want to order.

DPMS .308 24" fluted bbl with A3 top (on order, ETA APR 2010)
CMMG lower (in DROS, pick up is Friday)
Daniel Defense 12" rail (on order, with local armory)
Magpul PRS AR 10 Stock (on order with magpul)
Mappul MIAD (on order with magpul)
Magpul BUIS (on order with magpul)
DPMS LPK (on order with magpul)
Leupold Mark IV 4.5-14x50 with super high rings (on order with Leupold)
Need:
Buffer tube/Buffer spring/Buffer ... can i get a standard A1 tube/spring/buffer or do i have to get a .308 one? If so, is there anywhere in so cal that i can pick that up or will i have to order online?

Trigger: I would like a nice 2 stage trigger, but it seems that it's impossible to get a geiselle and jewel doesn't make any for the .308 (according to the guy i spoke to at jewel yesterday. although, i did say AR 10 and now i'm not sure if what i'm building is even an AR 10)

As you can see, i've spent just over $3668.53 give or take and all i have to show for it is a the lonely lower parts kit that i have sitting at home. I should be completing most of the lower build this weekend after i pick up the lower on friday, but i dont know what buffer tube i need to get. i would like to pick up a trigger, but i dont know what will fit the CMMG lower on that either.

anyway, i've tried searching, but an AR 10 search came up with too much and the AR 10 Trigger or Buffer Tube didnt come back with anything. if anyone has any experience with this stuff please chime in. thanks again for all the info you guys provide.

ed

[ar15barrels]

Buffer tube/Buffer spring/Buffer ... can i get a standard A1 tube/spring/buffer or do i have to get a .308 one?

You need a regular A1 buffer tube to use that PRS stock.
You need a 308 specific rifle length buffer and spring.

[s2000news]

You need a regular A1 buffer tube to use that PRS stock.
You need a 308 specific rifle length buffer and spring.

Yup! Found out on my 308 build.

Just waiting on Magpul parts and I should be ready to rock.

Edit: I used a POF lower, and required a sleeve to mount the DPMS upper. I don't think it will apply to you. I used a RRA 2 stage trigger in my build. I was thinking of upgrading to a nicer trigger... but no decision yet.

Where are you located?

[bcrich]

That sounds like a nice build you are working on. The standard A2 buffer tube will work but you need a 308 buffer and spring. I have a dpms lpk and my trigger sucks big time hopefully yours will not but I have to change my trigger soon. Your build is a 308 AR.....AR10 would be an ARMALITE rifle but I always hear people at the range calling my rifle a AR10...whatever, shoots nice groups even with my heavy trigger. I have a POF lower with the same upper you will be getting and like its performance so far with handloads!

[ar15barrels]

I always hear people at the range calling my rifle a AR10...whatever, shoots nice groups even with my heavy trigger. I have a POF lower with the same upper you will be getting and like its performance so far with handloads!

Bring it out to APS this weekend...

[Edditty]

Thanks for the quick responses!! I'm gonna go pick up the standard tube today, i think i can get the buffer ans spring from the dealer i ordered the lower through.

Hey S2000, i'm in orange county and i've been getting a lot of stuff through OC armory. They're prices are pretty good. You can pretty much get anything at the average internet price there and you dont have to pay for shipping. Only complaint is that they never call you back for price quotes, but no one seems to do that.

Also, how do you like that RRA 2 stage trigger? i've been reading on some threads here that it's not very consistant and that it ends up being like a single stage after a little while.

I've also read that just about any trigger will fit, but the .308 needs a heavier hammer when shooting reloads or what not and that AR 15 triggers are not recommended. Any truth to that? Only thing i've seen so far is a Jard SINGLE stage on brownells that for the .308 for $160. I was really hoping i could find something in a two stage...

[ILVSMOG]

My DPMS trigger was crap as well. I sent it to Bill Springfield and it's much better now.

FYI: I have a MIAD grip on my DPMS-pattern 308 AR and, in stock form, the MIAD will not hold the rear takedown detent spring in the receiver. I had to use epoxy to fill the void in the grip where the spring sits to keep it in place.

[s2000news]

Well, the RRA and LMT 2-stage have done well in my 556 setups. Have 5K rounds on the LMT and its as it was day one.

The 308, I don't know yet. The trigger does seem a bit heavier than my 556 (RRA) trigger. I will know once I get my stock on and hit the range with it in a week or so.

I have heard different opinions on triggers in 308 builds. I will try my 2-stage RRA first, if I don't like it or have issues, will move it to the 556 and buy something new for the 308.

Thanks for the quick responses!! I'm gonna go pick up the standard tube today, i think i can get the buffer ans spring from the dealer i ordered the lower through.

Hey S2000, i'm in orange county and i've been getting a lot of stuff through OC armory. They're prices are pretty good. You can pretty much get anything at the average internet price there and you dont have to pay for shipping. Only complaint is that they never call you back for price quotes, but no one seems to do that.

Also, how do you like that RRA 2 stage trigger? i've been reading on some threads here that it's not very consistant and that it ends up being like a single stage after a little while.

I've also read that just about any trigger will fit, but the .308 needs a heavier hammer when shooting reloads or what not and that AR 15 triggers are not recommended. Any truth to that? Only thing i've seen so far is a Jard SINGLE stage on brownells that for the .308 for $160. I was really hoping i could find something in a two stage...

[Intimid8tor]

My DPMS trigger was crap as well. I sent it to Bill Springfield and it's much better now.

FYI: I have a MIAD grip on my DPMS-pattern 308 AR and, in stock form, the MIAD will not hold the rear takedown detent spring in the receiver. I had to use epoxy to fill the void in the grip where the spring sits to keep it in place.

that's good to know. I just built a pof 308 lower/dpms upper rifle and an aero lower/eagle upper ar10 and I want to change the pistol grips. I think I'll go with the ergo grips.

[Edditty]

How do you quote people?

Anyway, ILVSMOG, was the hole on the MIAD for the detent spring just too deep? How did you know how much epoxy to put in there? How does your safety function?

[Eroland7]

just hit the "quote" button on the bottom right corner of their post.

[ILVSMOG]

How do you quote people?

Anyway, ILVSMOG, was the hole on the MIAD for the detent spring just too deep? How did you know how much epoxy to put in there? How does your safety function?

Click "Quote" at the bottom of their post.

On the MIAD, where there should be a flat surface to support the detent spring, there is a void. This is due to the removable/adjustable front and back straps on the grip. (which is why I bought it). The side effect of this is that the detent spring on the DPMS-pattern, 308 lowers lines up perfectly with one of the voids in the MIAD. I chose the backstrap that fit my hand the best, then I used some epoxy (JB Weld) to fill the void in the grip. After it dried, I filed and sanded it smooth and installed the grip on the receiver. Problem solved. The only downside is that I'm basically stuck with the backstrap that's currently installed in my MIAD grip. It's the one that fits me correctly, though, so I don't see that as a problem.

[Jase858]

RE:

You need a regular A1 buffer tube to use that PRS stock.
You need a 308 specific rifle length buffer and spring.

Does it matter which manufacturer of the buffer spring and buffer to use? I am planning on using a DPMS Upper, so should I get the DPMS Buffer and Buffer Spring? Otherwise, could I use a Stag buffer and buffer spring?

[Edditty]

Doesn't seem to matter. I did just what ar 15 said, got a regular a1 buffer tube, got the rifle length 308 buffer and spring. Its going to be really really hard to cycle the weapon and the spring is going to feel likes its too long, but fire some rounds through it and it feels just right afterwards.

[telcolineman]

.308 buffer and spring are $24 plus s&h from armalite, Just FYI