I bought a sear last year. It came with a trigger pack, but at the end of the day it’s the sear that’s most coveted. You can put it into any pack style and move to from gun to gun. I’ve bought 3 ptr guns just to serve as hosts. If i owned an HK host i’d never shoot it cause i don’t want to fck up an expensive host. Ptr-9ct, ptr-105(8” .308) ptr-32 (x39) and soon a ptr 9kt. The 9mm’s come ready for FA, and the other two just require a bolt carrier/weld and maybe some new rollers to set gap. That’s my take on hk sears/guns/packs. YMMV. For me practicality (being able to shoot the snot out of this expensive ass piece of metal) was more important than price. But i lucked out and got a good deal on one. What is your price range OP?