Hi, I've done my due diligence and searched the forum about the topic b4 posting. I saw many posts related to the Adams Arms and S&W uppers occasionally keyholing. My question is a little different.
I bought 2 cases of the spam cans and I think 1,000 rounds of Wolf before I even had the upper. I want to say I have maybe 500 - 750 rounds through it and never had a keyhole. However, I'm probably averaging 2" at 50 yard, opening up to 4 or 5 at 100. Is this what you'd expect to see? Regardless of whether shooting the surplus or the 70 gr. Wolf, this is pretty consistent.
I'm using a Burris 4.5-14x scope on a YHM riser. I'm using a RRA lower with a Geissele SR trigger. With a RRA SR upper and this lower, I don't have a problem shooting sub-MOA off the bench. And yes, someone else has shot the rifle with similar results.
The only modification I've made to the rifle is that I installed an MI free float rail specifically for this AA upper. I thought that might tighten it up a bit over the handguards, but it accomplished nothing accuracy-wise. I've also tried removing the A2 flash hider and shooting it this way, no improvement.
One of the reasons I decided to remove the FH to begin with was that I wanted to get a look at the crown. To my eye it doesn't have much of one compared to a bolt gun. But then again, I just looked at a brand new DPMS .223 barrel I have and it doesn't appear to have much of one either.
I'm debating about renting a .20 cal crown cutter and having at this. I've only known of one person to claim sub-moa with surplus and this combination. They also stated they had a much higher top end power on their scope. I would prefer more power for shooting off the bench at 100, but it's not like I'm shooting bugholes at 50 yards where 14 is plenty of magnification.
Now, I realize what this upper is and what I intended to really use it for when I bought it. And I obviously know I'm shooting corrosive Soviet surplus. I'm just a little baffled that the Wolf is just as bad. I'm somewhat tempted to buy either the Hornady 60 gr. or some other flavor of Wolf, but I don't think I'm going to gain anything.
I read enough posts here where guys were reporting very good accuracy from the S&W upper. I'm just wondering if this is the nature of the beast with the piston. It's not unusable, I just thought it would do at least 2 MOA. I would think that both these uppers might actually have the same barrel from T/C. It is 1:8 btw, and I cut off the delta ring to install the MI rails. The handguard cap is still attached but doesn't touch the end of the rail.
I'm sorry this is so long-winded but I am asking for help/opinion and I didn't want to leave details out that seem pertinent. No, I haven't contacted AA to complain about accuracy either. I'm not sure I would bother regardless of what I do or don't do to the rifle in the future. I had also purchased C products 5.45 well in advance of buying the upper. I have had no feeding/ejecting type of problems with the upper at all. It runs like a top, just wish it grouped a little tighter. Maybe I should have more diminished expectations? LOL, thanks in advance.
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