It's been around a couple of years I think. Mine doesn't have one and the need for it has never come up. I do not recall the reason they added it, maybe submission for .mil contract?
I'm completely guessing here but back when I was in the Army, I believe the theory for them was if you are in a combat situation and unable to clean your rifle as you desire, it was there to help you set the rounds home in a "sticking situation" due to carbon buildup in the bore.
It was worthless during a jam but if your rounds are failing to seat properly, which CAN occur in the field when proper cleaning is not always feasible, THAT is where the real value comes in.
For our civilian purposes, if you ever need to use it, you probably either "rode the bolt back too slowly and was holding the charging handle", the rounds are not quite within specs and don't seat well, or you just REALLY need to clean your rifle.
Since it is easier, when manufacturing mass amounts of pretty much anything, to do so with a standard production model, the forward assist simply rolled over into the civilian market not so much as a necessity, but more as a added selling feature that would enable Armalite to manufacture less different types of products and thereby reduce cost to the consumer.
What does the forward assist actually do then?
Is it for when the rifle gets dirty and won't fully chamber a round?
Please bear with me, I'm a bit hungover from new year's eve. FYI - Alcohol and explosives/pyro are NOT a good mix. At least my son knows how to tamp a charge now. Thank God it rained...
Prototype M16s were slick sided, since the bore and chamber were chrome lined and the new 5.56mm round was built using a cleaner burning stick-type powder (DuPont released this powder to the public as IMR 4895.)
Production M16s were still slick sided, HOWEVER they were manufactured without the chrome lining. Also the Army built M193 Ball ammo using the spherical powder that it had on hand (This powder was very similar to BL/C(2) and Win 748.) This powder burned faster and gave the round a higher MV. The downside was this powder also burned dirtier, creating more fouling
Unlined barrels, dirty ammo, no cleaning kits/lube (The troops were told the the M16 was "self-cleaning"), and the heat/humidity of Viet Nam all combined to cause a lot of failures and malfunctions resulting in the deaths of many fine American fighting men.
The M16A1 fixed the biggest problem - the bore and chamber were chrome lined. Colt also added an external forward assist. The Army issued cleaning kits and comic books (PM Magazine) on the care and cleaning/lubing of the M16A1.
Stoner's original design DID incorporate a forward assist. See that scalloped area on the right side of the bolt carrier? It's about the size of your thumb, isn't it...
I know how to make some pretty interesting stuff myself although I won't be posting any of it - you SHOULD try my fried green beans, hamburger and American cheese recipe sometime though....mmmmmmm :laugh:
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