The weak side hand placement is effective with no special thumb relaxation. Thumb relaxation from Ronni works on MCK if you want. Shoulder strap attaches on either. No pistol brace extension wanted. MCK takes advantage of pistol's slide launch so no mal-features like Ronni. The only thing the Ronni has https://glock-stabilizer94714.webdesign96.com/26518892/fascination-about-recover-20-20