COMPACT LOCKING BLOCKS IN RAW 4130 NO HEAT TREAT BUT BLEM AND MAY REQUIRE SOME FITMENT TO MAKE FIT CORRECTLY. 

READ ME!!!  - NO RETURNS, WARRANTIES OR ADVICE GIVEN THESE RAILS ARE BLEM AND WILL VERY LIKELY NEED SOME WORK TO MAKE FUNCTION CORRECTLY AND FIT THE INNER CLEARANCE FOR THE BARREL LUG CONNECTION WILL NEED TO BE WIDENED AND SMOOTHED OUT AND THE RAILS MAY BE A LITTLE WIDE AND/OR WARPED OVERALL PREVENTING INITIAL FITMENT INTO THE FRAME IN SOME OF THEM THE RAILS MAY BE A LITTLE TALL PREVENTING SLIDE INSTALLATION. IF YOU ARE NOT COMFORTABLE WORKING ON THESE ASPECTS DO NOT BUY THEM! THEY ARE $20.00 FOR A REASON!