My little AR

I acquired recently a new primary arms scope. It’s the 4 by 14 power first focal plane. The fit and finish it looks amazing and it bounces out real well with the extended neck mount from arms defense slight issue though 55 grain from PMC and stack. At 50 yards for the zero. I decided to take it out to 100 yard do you have it slightly above the bullseye. Apparently it was a big issue of it could not cold even a 6 moa of impact and was at the 11 and 12 position. I’m still trying to figure this issue out but currently looking at getting some 62 grain rounds to help the problem if it fixes it. At this point if that doesn’t do the trick then I’m going to send this thing back ASAP

To say all this has anyone else had experience with primary arms acss Optics I seen a lot of people have great reviews and performance from it scenes like I always land with the dud.

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Great looking rig. I love 62gr. It’s my happy sweet spot.

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What groups was it shooting before you added the scope? I have a couple of their scopes and haven’t had any problems. Try a different scope it
or a red Dot and make sure it is the scope and not the rifle. Also sometimes the scope mount isn’t good.

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worked that out at the range with a canted optic and the mount tighten up. after that i was still a pain in the ass. called up and they told me to try a heavier load in the 62 gr range. I’m running a 1:7 twist barrel form stag arms. the specwar did tighten it up a bit at 100 but not by much. at 50 yards i can stack dimes.

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You might try some 69 or 75 gr loads too.

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Nice looking package, never tried the optics thou

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In my experience I have never seen 1/7 twist shoot 55 grain bullets worth a chit…you should be shooting 62’s at a minimum, 70 and above is what 1/7 is for. It stands to reason after 50 yards your groups will do nothing but get worse with 55’s maybe even be tumbling at further ranges. Buy some 70 or 75 grain ammo and I feel you will see the difference.

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Maybe these:

62gr:
https://www.sgammo.com/product/223-556mm-ammo/20-round-box-556-nato-62-grain-bthp-match-hornady-frontier-ammo-made-lake-cit

https://www.sgammo.com/product/223-556mm-ammo/100-round-lot-223-rem-silver-bear-62-grain-hollow-point-ammo-zinc-plated-stee

https://www.sgammo.com/node/13385

^ Don’t laugh, I get respectable accuracy out of these Bear ammo

69gr:
https://www.sgammo.com/product/223-556mm-ammo/20-round-box-556mm-69-grain-sierra-hpbt-match-smk-otm-razorcore-imi-ammo-sale

https://www.sgammo.com/product/adi-ammo-sale/20-round-box-223-adi-outback-69-grain-bthp-sierra-match-king-ammo-aob223smk

https://www.sgammo.com/product/223-556mm-ammo/20-round-box-223-69-grain-bthp-match-prvi-partizan-ammo-pp57-or-ppm2231

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Wow. every one of my 1:7’s shoot 55 to 78 gr pills, all tight groups. I don’t think you could be able to determine any over stabilization effects of 55 gr rounds at 100 yards in a 1:7 properly built. Crappy ammo, 5.56 in a 223 chamber, equipment problems, yes. 1:7, no.

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Hey Mike!
Nice set up! Heavier projectiles and verifying the rifles average group would be a good place to start. Re mount the optic and see what happens.
I own 3-4 of the PA ACSS scopes and I have yet to run into an issue. Now that doesn’t mean that you aren’t lucky enough to get a dud.
Keep us up to speed on this please.

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I have a Stag Arms with the 1:7 16" barrel. Mine doesn’t shoot 55 gr all that great. It shoots 70 above really well, though.

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I did chuckle a little bit after Bear ammo and 223. Also it seems kind of sacrilege since I know the company for making ammunition for a case for the longest. But I’ll definitely take a look into the ammunition itself

From the site selection I was on the same Quest as well some ammo from them as well. They sell some pretty good stuff at a really good price. It is kind of frustrating or all that this scope has giving me so much trouble

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My Stag Arms is a 5.56 NATO so I took care of that to make note of it. Also I’ve tried over for brands of ammo, p.m.c, bear, but Army standard, and American Eagle. I went about clean the rifle making sure the mount was Secure to the rifle and the Rings were tight around the scope also making sure the scope was leveled as well. For some reason at 50 yards I get groups that I can stack on top of each other especially with the suppressor. But taking it 50 yards more it’s like the ammunition drunk LOL, spring out to 6 Moa high or low

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Wow I thought I was alone here, I really appreciate the confirmation on that I guess it’s just a Stag Arms selection on their barrels. Because I come from the Army I think of in 855 and the new ss109 and ones and 55 grain and the other is 62 I believe. My thought process is that if it’s mil-spec then it shouldn’t be issue

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It’s like a Mitch Match sometimes with mil-spec and depending on the manufacturer. Sometimes they can shoot anything and eat it like a pig or they’re very picky. I’m going to give it a try with some heavier ammo acquire a few boxes and do some box test on it. Hopefully when I zero it at a hundred I guess a nice tight groups.

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I hear you man and I really appreciate it, I will keep you all abreast of what’s Happening and hopefully this little Saga comes to a close with a nice tight group of 5 sets. Honest I know I’m going to take the rifle to the ultrasonic cleaner and get it a fresh start. Hopefully everything turns out well and there won’t be any issues

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How’s the crown of the barrel?
No nicks or burrs?

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Most do, it’s ok. :cowboy_hat_face: I have great luck with the Silver and Golden Bear ammo in multiple cartridges. Too bad they don’t have 10mm haha.

If you’re exclusively wanting 5.56 try these:

https://www.sgammo.com/node/46513

https://www.sgammo.com/node/56476

Big fan of the Hornady Black.

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Strange. Got my curiosity up. So you have a <1" group at 50 yards and a 12" group at 100? Is it 6 MOA right and left also or just 6 MOA up and down?
I have a Colt SPII HBAR 20" 1:7, and 2 Sig 16" 1:7, and friend has a Colt SP! 1:7. Peep sights, BUIS, scoped or red dot never that bad with 55’s.

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After confirming on 50 yd. The first Group at 100 yards if you can call it that was more like a star cluster but very far apart was at the 11 to 12 position on the target about 5 and 1/2 squares from the bullseye. Frustrated and trying to get it right because of the cold I shot a second group and that was towards the bottom right at the 5 position. The same distance as the other one one of the other gentleman here mentioned how 55 grain out of some barrels can have issues. He’s a stag arms owner as well @Equin.

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