The weak aspect hand placement operates and not using a special thumb relaxation. Thumb rest from Ronni will work on MCK If you would like. Shoulder strap attaches on both. No pistol brace extension wanted. MCK uses pistol's slide release so no mal-capabilities like Ronni. The only thing the Ronni https://collinssevf.life3dblog.com/25715857/the-fact-about-recover-20-20-that-no-one-is-suggesting