is a set of HK takedown pins to replace the "screw in a
screw" that holds the stock, trigger group and forearm on the GSG
series of carbines and pistols. Most users find the takedown annoying
and the screws quickly get beat up.
standard kit includes 3 small pins & 1 large pin. You can secure
your forearm and trigger group with the small pins without
modification. You must alter the opening through the buttstock and
trigger group housing tailpiece to use either the 3rd small pin or the large pin (9/32 or metric