AR-10 build anyone?

Mr_Roboto

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Okay, so this is gonna be a long and slow one. Probably a year or two, just because of expense and looking for deals. That said, this stuff isn't as simple as an AR-15. Here's what I've got so far, and what's on the way:

-Lower, 80% DPMS style
-Upper, Anodized DPMS "Sportical" Style (They have 3 variants, low, high and Sportical. If you want to use a rail, get a low or high. There is also an Armalite variant) This is slick side (no cover/FA.) I'm starting to think this is a mistake as the height seems to be a bastard child and getting a gas block/sight set that lines up with the rear will be a pain.
-80% jig
This stuff was from American Made Tactical and ran about $279 shipped.

-Magpul 25 round mags, $22 each from Midway. Definitely not your $10 PMAG-30s.
-Free Float Tube from ebay for $50. Yeah, it's cheap but I'm not spending $$$ on a rail that isn't at the right height.

My spreadsheet as it comes out now:

Upper/lower set,jigs $279.00 Upper “sportical”
Rail $50.00 Ebay Tube
Barrel $500.00
Trigger $100.00
Gas Tube $15.00
Gas Block $85.00 Integral front sight?
Stock, Buffer, Spring $70.00
Sighting TBD
Charging Handle $60.00
Bolt $250.00
Flash Hider/brake(?)
Mags $45.00 Pair of PMAG 25rd

Trigger The budget for the trigger is low, but it's plausible I'll end up working a stock style trigger like I did for my AR-15 build or using a National Match Trigger.

Debating on an A2 style stock or a collapsible at this time. May do the collapsible just for weight reasons, this thing's gonna be a tank anyways though.

Caliber is still up in the air. .308 would be the easy conventional way to go, but thinking .243 Win or an Ackley version is plausible. The budget for barrel may be a bit on the high side, but it's the spot where I want the money sank for this. It may also go into things like fluting as well to try and keep the weight down a hair.
 

Mr_Roboto

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What's the cost on the upper and is it DPMS compatible? I may return my upper if I can and see about getting something else.
 

Mr_Roboto

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Okay, so I'm working at trying to figure out some stuff. This height is one of four DPMS makes, a high rise (higher than this one), a low height and a low height with something like 60 thousandths difference designed to make their stuff proprietary so that the rail market is limited to them.

The height from bore center comes out to roughly 1.62 with the height from the lower mating surface to the top of the flange approx 2.37.

As a point of reference an AR-15 flat top's rail height above bore center is 1.250. This means that you're talking .37 to make up.

Looking at UTG's site (no pun intended) They have a 1.38 front as their standard and the "gas block" height is 1.66. That is .280. That still leaves me a full blown tenth too low, which may be serviceable with an aftermarket "tall" post or just adjustment depending on what range/velocity/whatever I calibrate to.





 

Mr_Roboto

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okay, so I ordered a gas block from DPMS. Cost $23 shipped, so I can't complain. The actual height from bore center of the gas block is .935. Doing some quick math we get:

gas block height=GBH
GBH+(GBH) sight-standard sight=X
.935+1.66-1.38=1.215 or about 40 thousandths short which would place the bullet higher. Makes sense if you're talking about a long ranged, iron sight gun probably. 40 thou is also adjustable with a sight post if need be.

It's a pretty well made looking gas block, it is a screw on though and it didn't include screws. I'll just get some set screws from the HW store.
 

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