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.308 AR build

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Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2017 at 10:18
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What barrel length and weight did you use?
You think that's heavy, try a SASS AR 10 with a 3-15x42 or 3-18x50 and QD mount.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2017 at 10:22
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18". Its a mid weight barrel. Though probably on the lighter side.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2017 at 10:30
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After the AR10 SASS, I picked up a DPMS GII Recon AR10 in a gun shop and almost put it on lay-a-way for a new deer rifle. Then I remembered I wasn't planning on hunting that year.

What do you think of the balance of the rifle with and without the suppressor?
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2017 at 11:02
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Its noticeably front end heavy because of that.  It weights 16 or 17 ozs, so it adds a whole extra lb right at the end.  That part sucks.  My other suppressor weights 10oz is 7" long, but it is a 6.5 caliber.  This one adds 9 inches to length.  I love shooting with suppressors, but hate how much weight and length they add.    

The barrel weight was 2lb 10oz

If I get to shoot it today, I will try some off hand with on and off and see how much it affects it. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2017 at 11:18
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My 308 AR is a 16" and it swings okay with a can (thunderbeast 30P or gemtech 300WM) but isn't nearly as quick as a suppressed SBR.  Then again, I am not clearing corners with it, so I can accept it.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2017 at 12:11
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Good point. Its purpose will mostly be a utv gun and hunting gun. So it ought to be fine.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2017 at 16:22
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Well I went and shot it and it is a bit under gassed.  So much so that it did not run the bolt back at all.  And of course I forgot the hex wrench to adjust the gas block.  It must be closed up tight.  So we will try again tomorrow. 

The Elftmann trigger is nice, absolutely no creep and it really does break like a glass rod. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/26/2017 at 19:07
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And overlube the bolt.

Sometimes underlubed causes the bolt to grind.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/27/2017 at 16:36
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Gas block was closed up tight.  I turned it out to max and started to shoot, and would turn it in a bit after each shot.  It has a detent so it turns 1/4 turn at a time between stops.  4.5 turns out is max.  I ended up 2 turns out.  There was as definite recoil difference from 4.5 and the 2 turns out.  At two turns out it would lock the bolt back on an open mag with the ammo I was using.  Federal GMM 175 grain.  Once I got the gas blokk adjusted I fired 15 rounds and it functioned perfect.       
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/28/2017 at 13:09
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Don't you have a gas bypass gas block?  I watched a video how to adjust it and I think at 4.5 turns the bypass is closed and the gas port is wide open.  More than 4.5 turns should open the bypass. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/28/2017 at 13:49
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Yeah, I don't think I explained that very well.  Two turns out from the 4.5.  It made sense in my head as I wrote it.  But I can see reading it again it sounded wrong. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/28/2017 at 13:54
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Gotcha

Love the rifle.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/28/2017 at 14:11
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I just read some more info on it.  Some people have got it out 12 turns and it still is locking bolt back.  I am going to have to tinker with it more, maybe I can go a lot more.  Also seeing some saying that it will cause a velocity decrease because of the gas bleed off.  Not sure how I feel about that.  If that ends up being true, I may just use it like a regular adjustable gas block.  Have to get the chrono out one of these days too it appears. 

I put a VXR patrol on it to try out.  Not sure yet how I want to scope it.  I am kindof wishing I would have bought the 14" rail instead of the 16".  But it is what it is now.  One thing about it, when you set off the round, you know it is putting something big down range.  Not a pipsqueak .223 round.  


Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/28/2017 at 15:45
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Yeah, with my 223 SASS, I can watch the bullet impact a 400yds and tell where I'm hitting, can't do that with the 308.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/29/2017 at 06:49
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Originally posted by supertool73 supertool73 wrote:

I just read some more info on it.  Some people have got it out 12 turns and it still is locking bolt back.  I am going to have to tinker with it more, maybe I can go a lot more.  Also seeing some saying that it will cause a velocity decrease because of the gas bleed off.  Not sure how I feel about that.  If that ends up being true, I may just use it like a regular adjustable gas block.  Have to get the chrono out one of these days too it appears. 

I put a VXR patrol on it to try out.  Not sure yet how I want to scope it.  I am kindof wishing I would have bought the 14" rail instead of the 16".  But it is what it is now.  One thing about it, when you set off the round, you know it is putting something big down range.  Not a pipsqueak .223 round.  


Yes, the 16" looks "overdone"...

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/29/2017 at 09:38
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Actually, I prefer the longest rail possible, helps in offhand (assuming you run your off hand as far forward as possible to drive the muzzle), and it lets you mount a bipod near the muzzle for bench work. With the can on it, it will look better.

There are several benefits to a long rail and few if any downsides.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/29/2017 at 10:58
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I just don't like the look of it...
Post Options Post Options   Thanks (1) Thanks(1)     Back to Top Direct Link To This Post Posted: April/29/2017 at 11:18
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I'm not a huge fan of the look either, but it is easier to shoot well. If it is to be a show piece, shorten that rail and maybe put some glitter on it, or maybe unicorn and rainbow stickers. Yea, that'd look sweet!
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/29/2017 at 15:35
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It isn't mine, so it doesn't really matter, but I don't believe a two inch shorter rail will have a significant impact.  Major advantage of the really long rail I see is the long sight radius for the irons. 
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/30/2017 at 12:11
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I think RC Made a good point about driving the gun. ST's rifle looks like most 3 gunners rifles do these days, as they drive their muzzles onto the target. Me on the other hand, can't break the habit of holding the forearm closer to the receiver, and would prefer the 14 inch forearm to save weight.
Looks got nothing to do with it. However some stripper dust (glitter) and unicorn stickers might change the looks of it.
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: April/30/2017 at 13:09
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You guys crack me up...

Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/01/2017 at 11:35
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I like a guard short enough to leave the gas block exposed so when you're shooting without gloves you really know you're alive. (Or that you still know how to swear).
Post Options Post Options   Thanks (0) Thanks(0)     Back to Top Direct Link To This Post Posted: May/01/2017 at 17:48
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Everybody... I mean EVERYBODY... knows... the glitter goes on the bullets...
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