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Posted: 5/22/2023 6:22:36 PM EDT
I would like to build / buy complete a "precision AR/MK12" clone. I plan to be using factory ammo only, no reloading. Since IMI 77gr seems to be in good supply, what are people's experiences with various barrels / rifles and that ammo?

I am targeting 18-20" barrel, DI gas system (no piston).

I have Larue ultimate precision upper from 2017 that has OKish groups (1.1-1.5 MOA at 100, using 18X scope). However, I wonder if there is anything better. I had BCM MK12 MOD 0 upper years ago and was NOT impressed by its accuracy.
Link Posted: 5/22/2023 7:18:45 PM EDT
[#1]
A 10-shot group group fired off the bench from my Lothar-Walther barreled AR-15 at a distance of 100 yards had an extreme spread of 0.95”.  20" barrel with a 223 Wylde chamber, 1:8" twist.




....
Link Posted: 5/22/2023 7:23:19 PM EDT
[#2]
My Criterion Core lies IMI 77gr. It does about 1 moa, and I am sure with a better shooter or scope it could be even less.
Link Posted: 5/25/2023 9:28:00 AM EDT
[#3]
I had a Larue Stealth 18" barrel that would shoot IMI 77gr razorcore under 1 inch at 100yards all day long.   I regret selling that upper but could not pass on the price i was offered for it.
Link Posted: 5/25/2023 9:33:14 AM EDT
[#4]
My CLE-chambered Bartlien 1:7 shoots 77 Razorcore at ~0.75moa (can do slightly under 1/2moa with optimized handload)
My 16” mid-gas Criterion 1:8 shoots it right at or just slightly under 1moa

I’m using 5-shot groups as my reference.
Link Posted: 5/25/2023 1:09:12 PM EDT
[#5]
I think the white oak SPR barrels are a steal for the performance you get.l and have always shot the heavier bullets well.  But I don’t have any razorcore to test with.

Load development:


MOA all day




Link Posted: 5/26/2023 1:33:45 AM EDT
[#6]
I have used IMI 77 and a copycat hand load that I turned speed down just a touch.  Larue 18 and buddies criterion 18 both put them just under an inch.
Link Posted: 5/26/2023 3:44:43 AM EDT
[#7]
I haven't tried grouping the Razorcore with my Douglas 18 inch barrel, but I was able to make a cloverleaf with my Lilja 16 inch. I don't have those fancy apps to measure it, but I think I have pic of it on my phone.
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