I’ve recently built a Rebel-9. It runs beautifully and made me wonder, “why not other calibers?” There are many 9mm PCCs designs currently and I wanted to spice things up and give a go at a DIY bolt for a different pistol round. My thought is to scale the size and weight of the bolt to appropriately accommodate said round (5.7, 10mm, 45acp) with SCS bolt face. Would use AR Barrel. Let me know if there are any ideas or suggestions. Also let me know if there is a reason this hasn’t been done before and am biting off more than I can chew lol. Thanks!
The bolt has to weigh a lot more for those other calibers in a direct blowback firearm. In 9mm the bolt weighs about 1.7lbs. For 45acp and 10mm the bolt would need to be 2.3 and 2.8lbs respectively. It can be done but would require a lot of work to change calibers.
Edit: Source: https://10mmautocombat.wordpress.com/blowback-bolt-calculations/