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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.

NOTE: CURRENTLY these are shipping in 3-4 weeks after order. 

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  • The M-Lok stacked Block set consists of (1) M-Lok block and (1) stacked block.
  • The ADM Stacked QD Block set consists of (1) ADM QD block and (1) stacked block.


  • M-Lok Block- 16 oz
  • ADM QD Block- 18 oz
  • Stackable Block- 16 oz

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:

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