It’s said that Amateurs argue tactics - Professionals argue Logistics...
I've put a lot of rounds thru Hk416's - I like them, but they have their spots too. Stripping an Hk416 is a lot different than a M16FOW (Family of Weapons) DI system.
I work for KAC, and am a believer in many of our products, but the fact remains, having carried M16FOW’s for over 20 years, the biggest issues I have as a ##### are the magazines, and in my experience over the last 3 years, the Magpul PMAG solves 99.9% of the problems.
As for the issues with lube etc. that the piston is cleaner naysayer crowd likes to crow about.
1) How many rounds do you NEED to have before maintenance?
2) Recoil Increase and Frame life span decrease from piston impact
3) Increased Weight
4) Added parts
Now Bolt Life; Currently an average of 5-6k for the Standard M16FOW bolt, and this decreases upon shorter barrels, and increased firing schedules, and suppressor usage.
Our (KAC) E3 bolt will go 25k on a suppressed 11.5 SR16E3, the barrels (Diemaco/Colt Canada CHF) typically go bad around the 18-23k time frame depending upon if you do a lot of auto, or rapid semi.
LMT makes an altered cam path (and others do as well) bolt, designed to be used on suppressed guns to give additional dwell to slow unlocking to reduce chamber fouling.
Several companies have lubricant finishes that can be added to parts that reduce or eliminate the need to additional lubrication.
Barrel – my thoughts and experiences about Colt Canada/Diemaco barrels are on record.
Free Float Rail
No change in zero when adding laser/optics, or grenade launcher modules. Additionally USNSWC Crane testing shows that free floated barrels have longer standard bolt life, and increased reliability.
All of which can fit within the current framework
Yes it’s still a logistical problem, but an incrementally solvable issue, unlike dropping a new system into the mix – for no real gain