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Groups moving and spreading out.
2/13/2012 10:29:25 AM
I went to a match this weekend so before I went I went to the range to check zero. The local club I shot with has most of the shots at 25 yrds or less. The state match they move to 100 yrds or less.
I went to the range and at 25 yrds I was right on. At 50 yrds I was 6" high and 3" left. At 100 yrds I couldn't find the papper. I took the spare rifle out and hit 1" low at 50 and dead on at 100.
I know I can shoot so is it the scope or the barrel.
The barrel is an 18" Rock River Bull with about 3k down the spout.
The scope is a Burris 332 about three months old and 500 rounds.
Where do I start.
5 shot groups are 25 yrds were 1". At 50 they were 10"
I went to the range and at 25 yrds I was right on. At 50 yrds I was 6" high and 3" left. At 100 yrds I couldn't find the papper. I took the spare rifle out and hit 1" low at 50 and dead on at 100.
I know I can shoot so is it the scope or the barrel.
The barrel is an 18" Rock River Bull with about 3k down the spout.
The scope is a Burris 332 about three months old and 500 rounds.
Where do I start.
5 shot groups are 25 yrds were 1". At 50 they were 10"
2/13/2012 2:27:23 PM
Check for a loose barrel/hand guard nut.
2/15/2012 11:30:21 AM
Barrel nut. Try another scope. The barrel should still be good with only 3k fired. Does it look OK, any visible erosion in the first 8 inches?
2/15/2012 11:33:15 AM
Make sure the scope isn't loose.
2/15/2012 11:51:46 AM
Originally Posted By don5544:
The barrel is an 18" Rock River Bull with about 3k down the spout.
The scope is a Burris 332 about three months old and 500 rounds.
The barrel is an 18" Rock River Bull with about 3k down the spout.
The scope is a Burris 332 about three months old and 500 rounds.
Tested barrel, newish scope. I'd look at that, specifically make sure it isn't loose. Lose. Lossed?
2/18/2012 3:00:32 PM
Just finished working on the rifle.
First off I bought the barrel at a gun show from a dealer who said the barrel was a Rock River. Today with the rifle apart I noticed that it does not say Rock River. All the barrel has on it is "206/K". It does not list caliber, chamber, or manufacturer. Shouldn't have said more?
After I put the barrel on I was using iron sights. I figured it was my old eyes that I wasn't getting the groups I use to get. I went to a Eotech 512 and it seemed worse. Put the Burris on and I started cussing.
When I took the barrel back off I could take the barrel nut off by hand. It I tightened it up the nipples on the nut were in the way of the gas tube. Therefore I had just moved it back to get the gas tube in place.
Its pouring down rain so I'm not going to the range today.
Do I have a cheap knockoff barrel?
First off I bought the barrel at a gun show from a dealer who said the barrel was a Rock River. Today with the rifle apart I noticed that it does not say Rock River. All the barrel has on it is "206/K". It does not list caliber, chamber, or manufacturer. Shouldn't have said more?
After I put the barrel on I was using iron sights. I figured it was my old eyes that I wasn't getting the groups I use to get. I went to a Eotech 512 and it seemed worse. Put the Burris on and I started cussing.
When I took the barrel back off I could take the barrel nut off by hand. It I tightened it up the nipples on the nut were in the way of the gas tube. Therefore I had just moved it back to get the gas tube in place.
Its pouring down rain so I'm not going to the range today.
Do I have a cheap knockoff barrel?
2/18/2012 3:47:21 PM
Upper needed to be upper vise blocked and with the threads and bearing surfaces lubed with moly grease, the barrel nut tightened to 30ftlb, loosened, tightened again to 30ftlbs, loosened, then on the third time, tightened to 35ftlbs, then up to 80ftlbs to index the top spines of the barrel nut to the upper receiver gas channel. If you it 80ftlbs, and still have not gotten the top spine void to index correctly, back the barrel nut all the way off, and then go again with the final torque (again, do not go over 80ftlbs at any point, and make sure that where you are lubing, get grease on the front side of the barrel extension to the face of the barrel nut mating surface.
One you have the barrel nut correctly tightened/indexed for the gas tube to pass through the barrel nut upper spines and receiver gas channel cleanly, bore sight the barrel against the upper sights to make sure that the barrel did not slip in the upper barrel socket when the barrel nut was being tightened.
And yes, the barrel is RRA,
http://www.ar15.com/archive/topic.html?b=3&f=118&t=280677
One you have the barrel nut correctly tightened/indexed for the gas tube to pass through the barrel nut upper spines and receiver gas channel cleanly, bore sight the barrel against the upper sights to make sure that the barrel did not slip in the upper barrel socket when the barrel nut was being tightened.
And yes, the barrel is RRA,
http://www.ar15.com/archive/topic.html?b=3&f=118&t=280677
3/1/2012 1:33:46 PM
I got it fixed. It was the barrel nut not being tight enough. It took moly grease and a couple to times to get it tight enough and where the gas tube would fit. I'm getting 1.5 MOA and I'm happy.
3/1/2012 6:01:30 PM
Glad you got it fixed.
Hard to imagine the problem that these guys haven't seen.
Hard to imagine the problem that these guys haven't seen.
