Send it to Ruger. I just repaired one with the same complaint. I found several burrs in the cylinder lock channel along with burrs in the hand channel. Cleaned and polished and works great. I'm sure Ruger would like to know as it is a quality control issue.
Halfmileharry and PGRChaplain are right. It's a target model and threading the barrel will destroy the harmonics of the barrel and change its accuracy. Go to the Indy 1500 and get a cheap AR to put your flash hider on. It is your rifle though, personalize it however you want.
Gunsmith at...
Weatherby Model 92 Pump shotgun, 12ga., Full choke Barrel says "Proof Tested for 2 3/4" and 3" shells, Screw in choke. Taken hunting once used in a couple of skeet shoots at local gun club. Excellent condition. FTF within 50 miles of Richmond. Driver's license may be required. This is a sale...
SOLD- Weatherby Model 82 semi auto 12 ga, 2 3/4 inch shells, 26" barrel, full choke (screw in type), Excellent condition, less than 200 rounds ever shot through it. $325 obo. FTF, driver's license may be requested, will meet within 50 miles of Richmond. No trades considered. PM me with...
I have an original Fisher which doesn't have all the adjustment blocks. I've done sight installations on M&Ps. Glocks, Berettas, you name it. It works but as with any "Universal" tool it has its good points and bad. But it will work.