Cmdr, You do not have to loosen anything to set the scope. The flat headed screw is for when you get done zeroing the scope you can set the turrets back to zero.
I have read were some have used them on a .308 , with out any problem. So i think it would work on a .223 I think Mueller rates them on any thing other than mag rounds.
Mueller Scopes are some the best for rimfire . You get a lot of scope for the money clear all the way up to 14 power. For 161.00 you can not beat the Mueller APT
I put this together a few weeks ago, love the 16'' CZ . All three are very accurate with CCI SV.
Savage MKII TR 22LR
EGW 20 MOA Rail
Mueller APT 4-14x40
TPS Low Rings
Harris 6-9'' S Bipod -KMW Pod-Loc
Tac Ops Cheek Pad
CZ 452 22LR Varmint TH Stock
DIP Rail
Mueller...
Just got mine this past sat, The i wish is i had bought them before. I would buy again in a heart beat .
CZ 452 American 16''
Mueller APT
DIP Rail
DIP TORX Action Screws
TPS Low Rings
Harris 6-9'' Bipod
Tac Ops Cheek Pad
CZ 452 Varmint TH Stock
Mueller APT
DIP Rail
TPS Med Rings...
Glock Handguns Only For Me, I have used H&K, S&W, Beretta, Kimber, & Springfield All i own now are Glocks , I like Glock the best cause they work for me...
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