Home Forums Hunting & Shooting AR and Tactical Rifles 10.5" AR-15 5.56 Pistol

I put the Primary Arms 5X prism sight on the pistol to see how much it would shrink the 100 yard 10-shot group with M855, from the one I shot with the iron sights.

Whataya know, it didn't shrink the group any appreciable amount.



I did use the group to refine the zero.

I'll try some hpbt match, and 53gr VMax to get a better feel for the accuracy potential.

I might just put the irons back on it, and just keep it short and light.

I was shooting from a good stable position.

Seems about par for the course with M855 in some guns. I sold a rifle to a buddy that shot well for me, but he tried 855 and it shot like that. Once he tried my 75gr HPBT match loads though, it put 5 in a tight little cluster mostly all touching. Good ammo matters.

The one exception I've seen was the Steyr Aug I bought when Obummer got elected; for some reason that rifle shot pretty much everything into about 1.5-2 moa, including M855. I considered that really good for M855, but was unimpressed that it wouldn't do better with match loads.

Next time out we'll see how she does with three different handloads I have put together.

- 53gr VMax over 26.0 gr XTerminator

- 75gr Hornady HPBT over 24.5 gr XTerminator

- 77gr Nosler HPBT over 23.5 gr XTerminator



Those loads all shoot around 1.5 moa or so in the 16" and 20" ARs.

MM, What is the reticle or dot in the prism?

Suggestion - try that 75gr HPBT over 23.4gr of 8208XBR or Benchmark. It's not quite as fast, but consistently accurate in a lot of rifles, and more temp stable.

it's the Primary Arms ACSS reticle. Etched. Shows black, illuminates red or green. The center dot is 1 moa.

That looks like a nice set-up. Do you like the reticle or feel it holds you back at 100 yards?

I like the reticle. It's not a handicap at 100 yards at all. 5X with a 1 moa center dot. It is very easy to center in the round bullseye I drew on the target.



I originally had that sight on this 14.7" rig, the reticle tracks m855 very well. I have shot watermelon size rocks out to 600 yards or so with no problem.

The weak link in my opinion is the pistol brace (along with the ammo I'm shooting). The back end below the extension tube is fairly soft and rubbery. Probably not the best for consistency, and of course the LOP is maxed out at 12.5"

I understand there are some inherent limitations with the AR pistol concept. Mainly a close range hammer. I'm enjoying the journey so far, learning new things.

MM, check out the replacement strap for the SBA3 by lunar concepts. I put one on mine and it took a good bit of the "flop" out of the bottom of the stock and keeps the rubber pieces at the bottom from sliding off to one side. Still not a great stock for punching tiny groups from the bench but then again it's meant for pistol barrels. Works great though.

I m waiting on my palmetto upper as well. Trying to find a spikes to build the lower Going to throw a bcg from bravocompany in and will try an h2 or h3 buffer. Hoping for another sale on the geisselle ssa e trigger and slapping a red dot on this thing like a burris fastfire.

That's interesting.

You're so right, these pistols are not meant to be bench guns.....grin

Sometimes it's just in our nature to see haw far they can be pushed.

It seems like you have been pretty satisfied with the PA prism type sights. I am guessing you feel they are rugged and hold zero well? I have had the money sitting in my safe for a NF 1-8 but the A--holes will not sell me a capped windage and elevation model, so they have just lost a customer. How long have you had the PA prism?

jimmyp,

I bought the 5X prism with the 5.56 ACSS reticle a couple years ago. No complaints.

Since then I also bought a 3X prism with the 7.62x39 ACSS reticle for the 7.62x39 carbine.

The prism sights are a very clear optic, and the reticle is also very clear, with the diopter adjustability.

In the last few days I received the PA 1-6x24 with the 5.56 ACSS reticle. I mounted it up on the AR pistol, but it just seemed ridonkulous on there. Size and weight-wise.

The 1-6x24 plus the mount, weigh in at almost 26 ounces. Added considerable weight to the pistol. So I put the 1-6x24 on the 14.7" 5.56 carbine. Zero'd it in yesterday, seems nice.

Thanks

I believe I have this thing dialed to my liking, after trying a few things.

The carry handle keeps it light, but still has some longer distance capabilities, despite a fuzzy front sight with my eyes.

I set a 40/200 zero with the rear drum set at 3/6 minus 5 clicks (bottomed out). Midrange trajectory at 100 yards is only 2" above LOS.

I know the velocity is only about 2600 fps, but with the shorter sight radius, and local elevation, the rear drum is surprisingly very close. did some rock plinking out to 577 yards, and the rear drum was good to go.

I won't keep the bipod on there, but used it to get a solid zero.

I have a 16" M4 I built (tax deductible guns are cool) a few years back with a PSA CHF/CL upper. I've probably put 4-5k rounds through it at this point and it refuses to do anything but run like an ape.

If it weren't for finding a couple smokin deals on Colt barrels for a block 2 M4 and my wife's "early GWOT" M4 clone, I'd have probably done PSA again.

They're still the first place I'll look for something in stock when I'm looking for parts for a build, and one of the first places I'll send friends looking for stuff for their first build.

I've only had good experiences with PSA. That would include:

14.7" CHF/CL 5.56 upper
16" 7.62x39 upper
10.5" 5.56 upper
a few stripped lowers.

Just got my 10.5” pistol upper.

For general fun and anti-AntiFa, what’s best? 55 SP, 62 green tip, or 75/77 JHP?