Posted: 4/25/2006 5:15:34 PM EST
Based on my research here is what I have got:
USAF GAU & GUU Designations,
I have seen and heard a number of explanations for the GAU designation. I believe JohnReilly got the original designation correct, “Gun Aircraft Unit”. If you search the USAF inventory you will find other GAU designations, and they all refer to aircraft based weapons. So how did it go from referring to aircraft weapons to AR Carbines, I have no idea! I have heard that when it was used to refer to an AR Carbine, that it was commonly referred to as “Gun Automatic Unit”. However, I have also heard it referred to as Gun Assault Unit and Gun Air Force Unit. This thread is the first time that I have heard, Govt. Altered Unit, Gun Automatic Universal, and Ground Assault Unit.
So if that covers the GAU designation, what about the GUU designation? I have no real clue! I have heard Gun Universal Unit, but I can not confirm that with any USAF documentation.
On the specs for a GUU-5P,
There is really not a specific spec, in reality you will find a lot of variations that fall under the GUU-5P designation. Typically a GUU-5P will have:
Lower – Older A1
Buttstock – can be anything from the original aluminum, to one of the newer plastics
Receiver – could be an original slabside, or a later model with the fence
Piston Grip – could be the original A1, or an updated A2
Upper – Anything Goes, I have seen just about every possible configuration
A1 – with or without Forward Assist, Flat or Tapered Slip Ring, Older or Newer Carbine Handguards, A2 or M4 Barrel
A2 – with Forward Assist, with Tapered Slip Ring, Newer Carbine Handguards, A2 or M4 Barrel
M4 – Flattop (no carry handle), with Forward Assist, with Tapered Slip Ring, M4 Handguards, M4 Barrel
If you check the Guide as Forest pointed out you should be able to find some more info.
Below are also some pics:
Good luck with the build, make sure you post some pics when you are done.
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