Hm, I always thought forward assists was standard on the AR. Never could afford an AR, so I went with the mini-14.
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Forward assists were added with the shittier M16s of the vietnam era. You don't really need them as much anymore. I can count on one hand how many times I've ever used it through the thousands upon thousands of rounds I've fired, and that was generally only when I had an A2. Never had to use it on my A4.
So, the creator of the rifle didn't think they did. The Army said they did. So he caved and put it on the M16A1.
Although I do take it back, I did use it a lo when I'd pull back the bolt just enough to observe the chamber and see if a round was in. I'd hit the bolt assist to get it back forward.