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We have completed a few builds with the JSD MUP-1 Fire Control Unit (FCU). The quality of the FCU is second to none. They use quality steel and it holds up to the abuse. Other than the MUP-1, we have purchased 80% AR15 and 80% AR10 lowers and the 5D Tactical Jig to complete them from JSD Supply. 

If you read our Tools Used articles, you will see that the majority of tools we use come from Brownells including those in the 80% Sig P320 builds featuring the MUP-1

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