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your gunworks suppressor also appears to be one of the early ones....posibly made by Robbie himself....you could go fatter and shorter in same brand.... but I compared a long skinny spartan,SIMILAR...

now RETAKE photo with rifles properly side by side....bottom rifle is 2" further back..look at the trigger guards and ends of forestocks...

also if Im reading your post correctly...you only want to change suppressor type...not looking to shorten barrel...you COULD just buy DPT with correct thread....but seriously I suggest you borrow one...

I do like the DPT suppressors BUT living where I do...its gunworks spartan for me....and with your 223,how much length will you actually save???past the muzzle,maybe inch tops....back behind...