what do i research next

ive been researching the m18 GMC and i test drove it but it has no stabilizer and i feel like it wont hold up in 6.0, is the m4 76 (W) A2? or the M6A1

ive been researching the m18 GMC and i test drove it but it has no stabilizer and i feel like it wont hold up in 6.0, is the m4 76 (W) A2? or the M6A1