Because of the importance of the alignment pin, it will be an extremely tight fit in the bolt catch detent and spring hole. You may have to drill the hole in your lower larger or sand down the pin for an easier removal but you should keep a very snug fit. The hole in the lower may feel smaller after different finishing methods such as tumbling, blasting, coating, etc.
NOTE: ALL BATFE/NFA RULES APPLY — New Frontier Armory LLC is not responsible for any city, county, state, or federal laws that you do not comply with when using this jig to finish your receiver.
Tool Kit is not included.