Continuing to expand the ZION family of rifles at IWI US this 18 Special Purpose Rifle (SPR) pays tribute to the MK12 with a modern day update which includes a 17 Free Float Handguard with integrated ARCA Rail steel barrel nut a B5 Systems Stock and Grip IWI 2-Stage Precision Match Trigger and includes one (1) 30 round Magpul PMAG. Proudly manufactured and assembled at the IWI US facility in Middletown Pennsylvania. - 18 SPR Barreled Models - 18 SPR Features a Custom Timney 2-Stage Trigger and ARCA Rail - 1:8 Twist Chrome Moly Vanadium For Maximum Compatibility with All Ammunitions - Nitride Treated for Durability and Accuracy - Free Floated M-LOK Rails for Accuracy and Accessory Compatibility - Caliber 5.56 NATO - Action Semi-Auto - Operating System Direct Impingement - Magazine Type Polymer NATO STANAG - Magazine Capacity 30 Round - Barrel Material 4150 Chrome Moly Vanadium HB - Barrel Length 18 - Overall Length 31.5 Stock Collapsed 34.75 Stock Extended - Weight 7.6 lbs - Rifling 5R RH Grooves 1:8 Twist - Stock Type Adjustable B5