To Complete the  RAZOR receiver blank you'd need to:

• Drill two 3/16 Cross Pin through holes
• Drill one 1/4 inch Rear Bolt Stop Pin through hole
• Drill one #16 wire bit through hole and tap receiver to stock hold down screw hole (#12-24 tpi thread) 
• Drill two #16 wire bit and tap barrel retaining V-Block through holes (#12-24 tpi thread).
• Drill open (recess) the openings of  the two barrel retaining V-Block holes .700 deep (1/4 inch bit)
• Drill/bore the barrel hole to 11/16, it will be center drill/spotted and pre-faced for correct head spacing
• Drill a 5/16ths x 1/4 inch deep magazine detent hole (requires long drill bit)
• Spot Drill 1/16th deep the bolt return spring rod seat with 1/8th drill bit (requires long drill bit)

Select Fire provides a tool kit to complete the drill work, it includes all the drill bits and the #12 - 24 tpi tap required for the stock and V-Block screws.

The RAZOR receiver blank tool kit includes the following items:

• 1    3/16th drill bit                                    
• 1    1/4 inch drill bit                                 
• 1    #16 wire drill bit                                
• 1    #12 - 24 tpi tap                                 
• 1    6" long 43/64 ths drill bit (3/8 inch shank)     
• 1    8" long 5/16ths drill bit                      
• 1    8" long 1/8th inch drill bit  
• 1    5" long 11/16 Reamer 3/8 shank               

Receiver Tool Kit