The Valkyrie target is cluttered but I am talking about the circled groups. The rifles are relatively new, both are less than 100rds post breaking in.
Of the two rifles, one has the Compass Lake 18" SPR style barrel with headspaced bolt intermediate length gas, the other is a Palmetto State 20" PSA Valkyrie barrel bolt combo. (But not advertised as headspaced) the Val is shooting the cheap 75 grain American Eagle, of which I have always been impressed by this rifle's performance.
The MK12ish was firing hand loaded 75gr that my other 5.56 rifles love. The 62gr green tips, and my 55gr 223 blasting load did just as crappy.
Both of these rifles were assembled the same. The upper was lapped the barrel has been seated and locktight 609 was used on the barrel extensions. I own and use both foot and inch pound torque wrenches. The gas block on the Val is clamp, the MK12ish is set screws. The rear set screw had a dimple on the barrel, and the front set screw I flattened to keep the pressure on the barrel even since there was no dimple for it.
After getting at home I inspected everything on it, and almost completely tore it down. There is no evidence of the hand guard contacting the gas block, the BCG looked fine, the scope (leupold MK4 LR/T) is, and was on securely. I fired if from the bipod, and off a bag. As you can see by the groups I fired with the Valkyrie I am capable of shooting substantially better than this.
I am at the point of the only thing I can figure is to tear the barrel off re torque and totally reassemble the rifle unless there is something I should look at first. This is far from the First AR I have assembled, but this is by far the worst results.
(Solved, the scope is broken)
Of the two rifles, one has the Compass Lake 18" SPR style barrel with headspaced bolt intermediate length gas, the other is a Palmetto State 20" PSA Valkyrie barrel bolt combo. (But not advertised as headspaced) the Val is shooting the cheap 75 grain American Eagle, of which I have always been impressed by this rifle's performance.
The MK12ish was firing hand loaded 75gr that my other 5.56 rifles love. The 62gr green tips, and my 55gr 223 blasting load did just as crappy.
Both of these rifles were assembled the same. The upper was lapped the barrel has been seated and locktight 609 was used on the barrel extensions. I own and use both foot and inch pound torque wrenches. The gas block on the Val is clamp, the MK12ish is set screws. The rear set screw had a dimple on the barrel, and the front set screw I flattened to keep the pressure on the barrel even since there was no dimple for it.
After getting at home I inspected everything on it, and almost completely tore it down. There is no evidence of the hand guard contacting the gas block, the BCG looked fine, the scope (leupold MK4 LR/T) is, and was on securely. I fired if from the bipod, and off a bag. As you can see by the groups I fired with the Valkyrie I am capable of shooting substantially better than this.
I am at the point of the only thing I can figure is to tear the barrel off re torque and totally reassemble the rifle unless there is something I should look at first. This is far from the First AR I have assembled, but this is by far the worst results.
(Solved, the scope is broken)
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