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PRC Gravity Block

This stackable weight system is available with both an M-Lok attachment system or American Defense MFG’s patented QD Picatinny rail mount. Weighing in at 1 pound each, Gravity Blocks are machined from nitrided steel billet. M-Lok Gravity Blocks can be easily added or removed in seconds with a single Allen key, while the ADM QD configuration allows for tool-less removal. STACKED SETS COME WITH EITHER MLOK, ARCA OR 170-S BASE BLOCK AND ONE STACKER WEIGHT.
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  • The MLOK stacked Block set consists of (1) MLOK block and (1) stacked block.
  • The ADM Stacked QD Block set consists of (1) ADM QD block and (1) stacked block.


  • MLOK Block- 16 oz
  • ADM QD Block- 18 oz
  • Stackable Block- 16 oz


  • Each Block is 3" Long x 2" Tall x .72" Thick


  • Nitride Finished Steel

FFL Terms and Conditions - Any items placed on the same order as a firearm/lower receiver will also be shipped to the FFL. If you would like additional items shipped to you directly, please place them on a separate order. To expedite your order, please have your dealer fax or email their FFL to us. If the dealer you are using to transfer a firearm has not sent us a currently updated FFL to put on file, there will be an extended period of time needed to process your order. Due to the high volume of orders, please allow up to two weeks for delivery of firearms. Email: [email protected].

Very Nice

I actually special ordered the ARCA version without the clamp as I use an ARCA Lock system and already had clamps. ADM worked with me for the special order to which I'm very grateful. We are using this on our CZ 457 in a Manners stock. It balances perfectly with the bipod but needed a little extra weight up front when removed. The front weight is maxed out with a weighted ARCA Rail. This was a great way to have the extra weight for balance out front that can easily be swapped out with the bipod. It's low profile and smooth enough not to get caught on things and will be great for NRL and PRS shooting.
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