M16 and XM177 model revamp
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Description

Current AR-15 models in SOG:PF have several issues that could be fixed at some time, to bring the models closer to the real-life counterparts.

Note: in-game AR-15 rifle is called "M16", however it seems that it's supposed to be M16A1, so that's the baseline for my "gripes".

Wrong buttstock on M16A1 - currently gun is modelled with "E" type stock that has compartment for cleaning kit. However this type of stock was available as early as 1969 (with other sources claiming 1971) - for 1968 setting of SOG:PF the "D" type stock is more accurate (photo from 1968). "D" stock doesn't have cleaning kit compartment, hence (today considered almost "iconic") the need to keep cleaning tools in other places - cleaning rods attached to the handguards, or oil bottles on helmets.
Wrong handguards on M16 and XM177 with XM148 launcher - to attach the grenade launcher, M16 was equipped with special handguard. In case of short-barrel variants (like XM177), bottom part of handguard was removed, and grenade launcher attached to the barrel.
Wrong configuration of rear sights - at the moment both guns have two apertures, differently sized, and zeroed at 300 and 400 meters. However in 1960s and early-to-mid 1970s AR-15 used two apertures of the same size (2mm), zeroed at 250 and 375 meters (see also page 2-19 of 1990 Field Manual). A "low-light" sighting system with 7mm "ghost ring" aperture was introduced as early as mid-1970s, used on limited number of rifles in squad, and then carried over to M16A2. See "Additional Information" for further discussion.
Wrong buffer tube locking ring on XM177 - pre-M4 carbines used design without the "notches".

Additional Information

Iron-sights - due to the issue of peep-style ironsights obstructing much of the view in game (as opposed to real life application), it seems to me that current 300m aperture size (bigger one) should be used for both sight settings. Smaller aperture, while more realistic, is just too punishing for the player. Additionally, to "recover" some of the lost field of view, the outer diameter of the sights should be reduced, aiming for the sight-picture similiar to this diagram.
Clip-on bipod - it might be worth introducing this accessory, as it was used quite frequently by USMC, as a pseudo-light machine gun, even until 1980s (introduction of M249 and M16A2).
M16A2 lower receiver - this issue is mentioned last, as additional information, because fixing it would require a significant amount of work. Currently both M16 and XM177 use "A2"-style lower receiver, with reinforecements in the rear (where lower mates with upper and stock) and the front (around the front take-down pin). Differences between "A1" and "A2" lower receivers are described in detail on Retro Black Rifle page (scroll down to "Lower Modification" section).

A number of these requests were originally posted by MacMac on the forums.