I have a 18" upper that is also based on a M5E1 upper/handguard. Once it was dialed in, it was just not as much "fun" to shoot. Decided I wanted a 16" upper so I built that. I didn't think it would bother me, but I was kinda bummed when I put them next to each other and realize with the YHM QD it's close to a 18" and the 18" was closer to a 20". Made the decision to go ahead and have it chopped and pinned by ADCO. Runs great once I dialed in the gas block to run ZQ1 (underpowered ammo in my experience) it had no issue with Perfecta or American Eagle. Over all I am happy with it.
Upper Parts-
M5E1 upper with 12" Mlok handguard
AIM Surplus Melonited BCG
Strike Ind charging handle
Ballistic Advantage 16" midlength modern barrel chopped to approx 14.2" pinned YHM QD FH, with gas port opened up to .100
Seekins Adjustable gas block
Spikes midlength gas tube
MBUS sights
GenI SPARC on a LaRue mount
Lower Parts-
M5 lower
LaRue MBT trigger (KNS .155 anti rotate pins)
LWRC ambi safety
MIAD
Vltor mod stock
PSA receiver extension (currently standard carbine buffer)
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