Fits most 16 mm barrels- .620"-.636". Can be shimmed to fit 15mm barrels like the R7 etc. Use electrical tape or shim stock on these barrels to get the proper alignment. ( 16mm-FWB Sporters 124-127, R1-80, 85,90,95, R9,10, RWS 34,36,38,45, and so on.
Front sight grooves require filing of the sharp edges which are always about 15 thou over the actual barrel size. MW will fit some barrels even with unaltered sight grooves. Fits some AA PCP guns as well as many others like HW, RWS, FWB, etc.
Four grub screw securement. 12 inches OAL average with an od about .860" or so. Anodized aluminum machined from aircraft aluminum. They can slide down over 11.25 inches on the barrel
Email prior to ordering for .25 caliber barrels or off center problem barrels. As supplied these fit .177, .20, .22 as standard