Trbo323

the best advise i can give you is get into paintball and then decide if you want to go mil-sim, none of the mil sim gadgets you put on your marker will make it better for paintball, they will actually only make it worse. nothing that works for actual firearms makes a paintball marker better

if you still want a marker that has a little bit of a milsim look there are some out there that have decent preformance along with a bit of a milsim look

as for the mr1 and bt4, i say mr1 over bt reguardless of either one having a e-frame the reason is, both are blowbacks but the mr1 is much easier to service and will be lighter and smaller than the bt.

also look into the SP1 and smart parts vibe, these two markers have some pretty good preformnace for their price along with a little bit of a milsim look

if you want to find something outside the mil sim market look into the spyder vs1 if your running co2 and the vs2 if your running hpa

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blue to black dm6
hyper 3
top hat mod
laser eyes
CP flow plug
32 degrees drop forward (yes i like my drop forwards)
cp micro on/off asa
deadly winds 14" fibur barrel with full freak
Dye rotor with speed feed
centerflag 68/4500 with on/off