Mine is as follows
2A Armament 5R pencil/taper profile 18" Rifle gas barrel
Jerry Miculek Muzzle brake
SLR Ultralight 16" handguard
SLR gas block
Aero M5 receivers
Geiselle High Speed Match Trigger
JP SCS buffer
JP VMOS aluminum BC
POF roller cam
MFT stock
POF buffer tube
TRS 25
About 7 - 3/4# empty, just over 8# with optic.
Kicks about like a 6.8 while shootin full powered 308.
I thought I wanted the 18" barrel to get the blast as far from my face as possible, but 16" would be just fine. It is still rather concussive, but bearable. You got to remember the recievers are longer. 16" handguard is a waste of length for the same reason.
18" rifle is soft, but with the recoil of 308 you would see little difference with a 16" midlength.
Pencil profile is TOO LIGHT. Mine really needs more weight on the muzzle. It is quick for up close.
If I had to do it again, I would pony up for the JP with the heavy profile up front for weight and just sell a body part to pay for it. What I have now is not accurate enough to hunt with unless I put a silencer on the end of it for harmonics.
Another idea I had was to just start with a DPMS Gen II 24" hunter. Chop it back to 18" and flute under the handguards or just turn it down to .75" or .80" under the handguard, add a JP SCS, High Speed Match trigger, preferred stock, and adjustable gas block. SLR and MI have GII handguards. Then enjoy the lightweight and compact form factor. I was unsure of this platforms future so I just built an M5 instead.