This counter is built around one family of guns: the roller-delayed HK pattern. The RD3 triggers and SEF selector parts are the core of it, the HK 5.56 and B&T units sit beside them, and the AR-15 and AK lines are here because most people who own an MP5 own one of those as well. Every reference listed is on the shelf.
Also: Rare Breed (35)
The whole roller-delayed line, in one place.
Every complete FRT on the counter that is not an HK.
What you order when one piece is worn, lost or the wrong throw.
Carrier and buffer parts, because an FRT is only as steady as what drives it.
Feeding for the AK side of the counter.
Bench kit, not gun parts.