TexasCHLforum.com

Dropping in a new/different bolt would require at a minimum checking the headspace and likely reheadspacing the rifle. This would require the use of headspace gauges and if you luck out and it ends up being tight, you could take material off the locking shoulder. If it's loose, you would need another bolt or another locking shoulder(not as easy to find assortments of shoulders like for an FAL). Your best bet is to remove what you have and it may require a fair amount of force to remove it if its never been out of the bolt.