Package includes:

SPRINGS:

• Bolt Catch Spring - easily confused with the disconnector spring; disconnector spring is tapered though.
• Buffer Retainer Spring - second largest coil type spring in the kit.
• Disconnector Spring – slightly larger than bolt-catch spring, identifiable because one end is a little bit wide than the other.
• Hammer Spring - largest of all the springs. 
• Magazine Catch Spring - this is the largest coil spring in the kit.
• Pivot Detent Spring - same as the takedown detent spring, so there are two in a kit.
• Selector Spring - similar to the takedown and pivot detent springs, but larger diameter; there will only be one of these.
• Takedown Detent Spring - same as the pivot detent spring, so there are two in a kit.
• Trigger Spring - the smaller of the two largest springs.

PINS:

• Enhanced Bolt Catch  - features improved grip surfaces and angles
• Enhanced Magazine Catch 
• Enhanced Magazine Catch Button - features improved grip surface
• Enhanced Pivot Pin - longer of the two large pins.
• Enhanced Takedown Pin - smaller of the two large pins.
• SI Selector Lever - 2 included in package
• SI Selector End Plate
• SI 60-90° 3-in-1 Selector Shaft - with screws
• Bolt Catch Plunger – mushroom shaped pin
• Bolt Catch Roll Pin - smaller of the two roll pins.
• Hammer Pin – solid pin with machined grooves; can be inserted from either side.
• Pivot Detent - same as takedown detent; both sides usually rounded or semi-conical.
• Selector Detent - one end is flat, the other pointed/semi-conical.
• Takedown Detent - same as pivot detent; both sides usually rounded.
• Trigger Pin - same as hammer pin; can be inserted from either side.
• Buffer Retainer  – large hollow barrel with small pin protruding from the top
• ** Highlighted parts are SI exclusive ENHANCED components