I'm looking for one shorty and one longer upper - I think a MRP might be cheaper than getting both though. and with the MRP I understand I have a quick change barrel and can swap a 10.5 with an 18".
1st - Shorty - a flat top upper with M4 feed ramps, 10.5 inch heavy barrel, low profile gas block, with midlength troy or samson handguard almost all the way to muzzle, and some kind of effective flash reducer.
2nd - SDM/SAM-R look - a flat top upper with M4 feed ramps, 18 or 20 inch SS barrel, flip up gas block, Acog , longest Handguard you got, same flash reducer.
And like i said, a MRP might be cheaper! So can you price me a MRP with 10.5 and SS18" barrel?