Barrel as with any marker
trigger frame of your choice
Beautiful anno patterens
The backblock wears out over time.
These are great little cockers. They were a bit pricey when they came out but can't be beat for fast and light. Now they are relatively inexpensive, if you can find one. The only cocker I will play with besides the micrococker is doc nickels fastback. However you can get a tweeked micro for the cost of a fastback body kit. BUY ONE, or if you find one for sale LMK.