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Old 12-14-2016, 01:45 PM   #1
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First EBR (well, EB&GR) build

Don't get me wrong, I'm still no fan of Stoner's poodle-shooter, still prefer something a little more traditional where I can use the butt to rearrange a threat's face or crack some ribs if I have to, but even AR-hater me has been forced to grudgingly recognize their utility. (And the Left hates them, and when a Democrat thinks you shouldn't have something that's a good reason to have at least three.)

Well, that and the owner of a local gun-forum had been talking for a long time about doing site-logo lowers on Group Buy as a fundraiser and I found some sources that helped him put the pieces together, so I felt obligated to chip in and help support our little Behind Enemy Lines enclave.

So, here goes... First, this is a heavy build--over ten pounds assembled but not loaded. It's not meant for humping out through the jungle chasing Charlie, it's more Home/Homestead/Cul-de-Sac Defense where when it's not on a bench or in the safe it'll be slung much and hand-carried little. Also, I'm used to schlepping a twenty-pound-or-more laptop case one-handed, having done so daily for most of my adult life.

Some things on here are overengineered, I'll admit that--I probably didn't need the anti-walk FCG pins but their presence gives me a bit more peace of mind. The stock is also rather heavy; hopefully it'll be just about right to cancel out the full-length handguard for balance. (Also, I have a friend who's active IDF where one of his troops had similar short-arm odd-torso issues*, and he tells me that this is pretty much identical to what his armorer did for that guy.)
*Admittedly, without all of my flab, but we're mainly looking at skeletal structure for the comparison.

The build... (upper still on the BBT)

This is something it'll never be seen doing, just for features demonstration--there's a low-profile mag carrier in the stock with the mag that normally fills it up in the magwell; the recoil pad has a retractable leg that complements the bipod (which folds into a foregrip) as a built-in benchrest. And at two clicks out from full retract, it's the first time a longarm stock has ever properly fit my shoulder. I've got a basic A2 grip and GI selector installed while I wait for the intended grip to arrive and watch for the right time and price on an ambi.


Weights in ounces...
Lower Assembly
--10.88 Lower Receiver
--7.52 LPK before adjustments
---deduct 0.32 for std FCG pins being replaced
---add 1.6 for replacement KNS anti-walk pins (net +1.28 )
---deduct 0.64 for std takedown pins being replaced
---add 0.96 for replacement YHM EZ-Pull pins (net +0.32)
---deduct 2.72 for std A2 grip being replaced
---add 4.2 for FAB folding maingrip (net +1.48 )
---final adjustment +3.08, 10.6 LPK subtotal
--0.96 Magpul BAD Lever
--9.92 buffer assembly
--20.1 stock assembly (excluding 10rds 5.56 ammo)
Current weight 49.42 oz.

Upper Assembly... well, I'm not going to include what I can't mount yet.
--73.6 CBC upper (out-the-door, includes box and cushioning)
---deduct 2.08 for A2 flash hider being replaced
---add 3 for Precision Armament AFAB-556 FH (net +.92)
---deduct 0.16 for crush washer being replaced
---add [unknown; at least .2] for PA timing washer (net gain, unk amount)
---add [unknown] for planned not-yet-selected blast deflector
--7.5 Diamondhead polymer BUIS
--6.1 optic assembly (Bushnell TRS25 on Leapers 1" mount)
--[unknown] not-yet-decided Keymod rail section for foregrip
--13.76 integrated foregrip-bipod-light
--13.12 DSArms BCG and CH
---deduct 0.16 for replaced CH latch
---add 0.48 for Badger Ordnance tactical CH latch (net +0.32)
Current weight 101.56 oz., with gain of at least 14.72 projected

The Diamondhead BUIS adds extra weight with its big clunky size, but the polymer version doesn't add as much--and while mockups are different from live-fire, they seemed to work better for my 20/400 half-blind good eye than the Magpuls I tried on a mockup at a local gun shop.

Magazines, add 4.0 for an empty Mission First Tactical SCPM556 (lightest full-cap mag I have).

Total empty weight comes out to 154.98 oz. unloaded, 9lb. 10.98oz. with more weight to come not even including ammo--throw in a full onboard load of forty Black Hills Mk 262 77gr MatchKings and that's another 1lb. 3.58oz. for a total loaded weight of 10lb. 14.56oz. while if memory serves an as-issued M4 is around 6lb. 9.6 oz. (And admittedly it's a bit of a highball because it includes the upper's shipping box too.)

Upper still on the BBT is a CBC free-float 5.56 NATO midlength, with 16" 1:7 twist barrel. (Only thing it'd need changed to be perfect in my eyes is the chambering.)

FF's are heavier, but they also offer more options on where your accessories go along with more of the rifle's length available for support-hand or barricade-support placement.

Oh brother... what have I gotten myself into? Now I'm starting to pencil out an M4gery for "agile" roles, a C8 clone for the GF once I figure out how to push the paperwork she'll need to borrow my irons while joining me on the range down here (figured with her being a Canuck and the C8 being their M4...) the "class jamomatic" retro pre-A1... and I don't even LIKE these things! LOL

Gotta admit it beats heck out of trying to cut an M14 or M1 Carbine down to fit my shoulder, though...
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Old 12-15-2016, 10:22 AM   #2
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Hey Diamondback, you're building it for you. Figure you know what you like, want and/or need.

I've got a 7" KMR on my Colt, the aluminum/magnesium alloy one, and I really like it. I wanted light and easy handling. I am built like a bowling ball with arms and legs of equally diminished lengths, so I understand length of pull issues. Hell I just put a 12" LOP Hogue overmolded stock on a recently acquired used pump riot...uhhh...tactical...shotgun so I could comfortably operate the damned thing.

It's your nickel. Build your rifle the way you like it.
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Old 12-15-2016, 04:02 PM   #3
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Old 12-15-2016, 04:25 PM   #4
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Originally Posted by t-star View Post
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Couldn't get one as a piece-by-piece DIY. That rear magazine is built-in ready-rack storage (and meant to be lo-viz storage when used with a shorty Klinton Klip like what's up in the well), not bullpup feeding since it's under the buffer tube.

While you're here... since Colt Canada doesn't do export to the US and all the C8 parts I've seen are "Canada Only No Export", can you offer any suggestions on trying to clone a C8A3? I know BCM does an upper and Triad FSB-mounted rail, but other than that and the funky CH could it be just as simple as "build an ambi-ized M4gery and hit the stock and handguard with the right shade of green Krylon or Duracoat"?

Here's a more normal view... pardon the intruding potbelly. lol Goes into the Vault for storage until I line up the last few parts, some ammo and a test-site on Saturday, so I'll slap the upper on temporarily and get some pics then before I lock it up.

Last edited by Diamondback; 12-15-2016 at 04:28 PM.
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Old 12-17-2016, 06:08 PM   #5
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Final assembled shot (other than grip on-order, rail to mount the foregrip and timing washers for the new FH still To Order):



As expected, this monster is HEAVY! Probably a lethal weapon even unloaded... lol And to think I was gonna mount an extra mag-carrier underneath and several more down the barrel sides... sure am glad I skipped that idea!
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Old 12-18-2016, 02:53 AM   #6
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One thing I really like about the AR is that it's an Erector Set. With a single lower you can have as many configurations as you like.
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Old 12-18-2016, 07:50 AM   #7
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One thing I really like about the AR is that it's an Erector Set. With a single lower you can have as many configurations as you like.
Yep. And one of the few firearms that just about anyone can truly custom fit for themselves, both physically and for specific purpose.
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Old 12-18-2016, 07:58 AM   #8
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Originally Posted by Diamondback View Post
Final assembled shot (other than grip on-order, rail to mount the foregrip and timing washers for the new FH still To Order):



As expected, this monster is HEAVY! Probably a lethal weapon even unloaded... lol And to think I was gonna mount an extra mag-carrier underneath and several more down the barrel sides... sure am glad I skipped that idea!
Looks good, Diamondback! Enjoy!

And remember, with an AR, if you find it doesn't suit you, you can change it! (Or buy another if the significant other doesn't mind too much.)

Last edited by IrishCop; 12-18-2016 at 11:26 AM.
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Old 12-18-2016, 11:02 AM   #9
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LOL, the problem isn't the SO... it's the bank balance,and the fact that she wants to play too. (Which is the real problem because with her Canadian citizenship, the dickless douchebaboons at State DDTC and Commerce EAR think that the gun pictured above goes from "somehow barely acceptable for civilian use" to "dangerous instrument of international mass death" just by having us trade shooter/observer positions at the bench.)

P*ssweasel Patrick Kennedy at State (Undersecretary for Management and Root Of All Evil) is the first person Trump should throw down his two favorite words on as soon as he's inaugurated...
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Old 12-18-2016, 08:40 PM   #10
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New question, on to AMMO.

I went with a 1/7 barrel so I could load Mk262s and similar heavyweights--what would you guys consider an appropriate variety of ammo types for functional testing, and how many rounds of each for basic checkout before it's "Cleared for Duty"?
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Old 12-19-2016, 03:25 AM   #11
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Boxes of appropriate ammo, four five-shot groups on targets at 200 meters

55 gr, 62 gr green tip, 77 grain HP, 45 gr HP varmint rounds.

The barrel and twist don't really matter much, it's how the individual rounds work in the individual rifle.

Geoff
Whose unfortunate accident and optical surgery have suspended his AR testing. Sigh.
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Old 12-19-2016, 08:57 AM   #12
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Originally Posted by Skeptic49 View Post
Boxes of appropriate ammo, four five-shot groups on targets at 200 meters

55 gr, 62 gr green tip, 77 grain HP, 45 gr HP varmint rounds.

The barrel and twist don't really matter much, it's how the individual rounds work in the individual rifle.

Geoff
Whose unfortunate accident and optical surgery have suspended his AR testing. Sigh.
I like Federal's XM-193 55 grain and the 62 grain green tip. Both work well in my 16" AR. They are reasonably accurate and seem to have the desired effects down range, at least from what I have been able to determine.

Geoff, hope your surgery was something relative simple and the healing period is fast. Get well quick!
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Old 12-19-2016, 10:30 PM   #13
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Amen, Terry, and GWS Geoff!
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Old 12-20-2016, 12:38 PM   #14
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Geoff, hope your surgery was something relative simple and the healing period is fast. Get well quick!
Simple but terrifying, I had the left eye cataract surgery last Tuesday. So far so good the Right eye goes under on Jan 3.

We will see (pun).

Right now I'm wearing my old glasses with no lens in the left frame. Tomorrow I do the one week follow up and prep for the next surgery.

Putting 3 different drops in my eye, 3 times a day is educational, especially noting the 5 minute wait between applications.

Naturally we had the house painted inside and out, they finished this afternoon, but last week I moved to a local hotel while the worst was accomplished.

Geoff
Who may have to learn point shooting, I know an instructor here in FL. Hey, if it's good enough for Matt Helm and the OSS.....
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Old 01-28-2017, 09:43 AM   #15
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Current status pic:


Rail section and keymod cover-panels on the way from Midwest (panels are BCM; man, are those guys a farking pain in the arse on not keeping track of what's due in-stock when! workaround for not having the green panels available is to bust out the Krylon), ambi safety and FAB Defense folding grip just waiting for me to get back over to the Vault and install.

Next problem: Anybody have formulas for figuring out how much eye relief I need on the RDS?
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