Just purchased this last week and it doesn't fit on my barrel diameter... This is the Magnetospeed Sporter MS_SP Barrel Mounted Ballistic Chronograph 9V Battery - Polymer. You can also use this device with muzzle brakes and flash hiders up to 2.7in long. Simple, one-button cycling display (shows recent shot velocity and statistics, plug in to turn on) Battery : 9-Volt (included) Easy access battery compartment, no need for screwdriver to swap batteries Three sensitivity settings for fine-tuning Integral, quick-attach strapping system; with metal buckle and triad thumb nut Integral 3.5 foot sensor cord Bayonet-style sensor (Bayo) Thick and thin rubber V-block spacers Heavy duty strap with thumb nut tightener Ultra-compact storage container Paid $180.00 Selling for $150.00 TYD Paypal |