I have money in hand and want the closest thing I can get to an M4 upper as possible including being able to afix a bayonet and stay out of club fed.  I understand the flat top, 'T' numbers, oval handguards /w double heat shielding, the ubiquitus feed ramps (still wonder if it's worth it),  and M4 profile barel.  BUT what exactly are my options to get a bayonet to work and still make length?

thank you in advance

artar

bushmaster will hook you right up