RomaRana,
All you have to do is swap out the gas piston ($35) and synthetic handguards ($40-50)for DSA equivalents on the M444.
With the DSA StG you would probably want to swap out the metal handguards for synthetic because the metal HGs on the DSA are known for getting uncomfortably warm with extended shooting. Or wear a pair of oven mitts to protect your hands, but you might get some comments at the range. Also with the DSA you'd likely want to swap out the straight-line stock for a humpback stock (which the M444 already has) because the straight-line stock hinders getting a good look through the rear sight. Again this can be corrected by buying the excellent Penguin humpback stock in either the basic ($30) or premium models ($50-60). Since you're paying about $100-150 more for the DSA StG58A (albeit an excellent FAL) + the extra $$ to correct some of the few short comings in the DSA, and M-444 you can consider your budget options. Both are great FALs, and can be further tricked out.
However, I really disagree with the gentleman regarding the Entreprise FALs. You don't hear much about them on the FALFiles. My opinions of course. If you want any additional feedback contact me off this board.
Regards,
Talyn