Early 580-series and older w/ thin, straight-profile 9/16" barrel.
Average of five 5-shot groups. Ammo: Federal 50 grain BTHP (jacketed hollow-point).
Comments: This is a fairly typical result for the older Mini-14, most delivering out-of-box performance of around 4-6 minute-of-angle (about 4-6" groups at 100 yards).
OK for a plinker rifle, but not very impressive by modern standards of accuracy.
Comments: Gun now shoots at a more acceptable level of accuracy. Groups reduced about 66%.
In general we see improvements in the range of 50-75% for the older barrel.