The weak side hand placement works without having a Particular thumb rest. Thumb relaxation from Ronni works on MCK If you need. Shoulder strap attaches on both. No pistol brace extension required. MCK works by using pistol's slide release so no mal-features like Ronni. The only thing the Ronni has https://sage-ts870r07306.affiliatblogger.com/78093727/not-known-factual-statements-about-recover-20-20