FN 66101379: The FN 510 MRD carries 15+1 rounds of 10mm Auto at the ready giving you the stopping power you need to face any threat. But holding all the power and capacity doesn\'t matter if you can\'t put rounds on target so it\'s made for pinpoint control red dot-ready with a crisp trigger and unrivaled ergonomics. All the elements for a premium shooting experience are on-board purpose-built to control maximum energy with minimal effort. - Specs - Caliber: 10mm - Operation: Double Action STRIKER-FIRED - Mag Capacity: 10 or 15 Rd. - Weight: 31.0oz - Barrel Length: 4.1 - Overall Length: 7.7 - Twist Rate: 1:16 RH - Height: 6 - Width: 1.45 - Trigger Pull: 5.5-7.7 lbs - Sight Radius: 6.1 - Primary Features - 15+1 rounds of 10mm Auto - Low-Profile Optics Mounting System - Precision-tuned trigger with clean break - Enhanced grip frame for unmatched control - Slide - Slide cut to mount most optics no gunsmith needed - Machined steel with front and rear cocking serrations loaded chamber indicator - Driftable steel sights co-witness with most MRD optics - High-endurance conical striker - Barrel - 4.1-inch cold hammer-forged target crowned for enduring accuracy - Polished feed ramp and chamber for feed reliability - Frame - Superior balance and grip texture dampen recoil and allow master control - Target-grade trigger breaks clean at approximately 6lbs - Interchangeable backstraps - MIL-STD-1913 rail - Operating Controls - Fully ambidextrous slide stop lever and magazine release - Magazine - Two 15-rd flush fit magazine or two 10-rd magazines - Low-friction follower; polymer base with nickel-coated steel body - Ships With - Two interchangeable backstraps - Two 15-round or two 10-round magazines - Four MRD mounting plates - Owner\'s manual - Locking device - Premium zippered case