Great solution for rifles serving double duty in competition - Sylvan Arms RAPID ATTACH MOUNTING SYSTEM R.A.M.S Competition Rifle Weights

I use 4 sets of these on my precision AR, and Sig Cross PRS/NRL rifles, for competition.

While they increase the barrel shroud/rail diameter, they seem to provide better grip points when clamping to a bag or barricade. In 1 month of use, 3 competitions, and lots of practice sessions, I haven't had one come off. The coating has held up to my abuse really well, and doesn't mar the rifles.

You can easily swap from rifle and they are the heaviest solution on the market. They also improved the balance point to just forward of the magazine well or right at an ARCA mount depending on where I place them.

One set did arrive missing some screws, then in the month I've had them, 2 screws and buttons fell off (The Sylvan team mailed some replacements right away, no charge). Use a non-permanent thread locker on the button screws to avoid the same issue.