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10/18/2025 8:09:52 PM EDT
I'm going mad trying to research the different carbine builds used by different units in the 90s. So I think I'm just going to build the rifle that I want, and retroactively match it to an issued rifle, if possible.

I have an M16A2 marked PSA lower, which is currently a 20" A2 clone. I never shoot it, because I'm not a fan of the configuration, so I'd like to give it new life as a carbine. Were there any carbines used by any units that had an A2 upper, an Aimpoint Comp M2, a 14.5" pencil barrel, and CAR stock with skinny handguards?
10/18/2025 9:44:33 PM EDT
[#1]
Sounds kinda like an XM4.
Build what you want and who cares what anybody thinks.
10/18/2025 9:49:37 PM EDT
[#2]
Quote History
Originally Posted By neight:
Sounds kinda like an XM4.
Build what you want and who cares what anybody thinks.
View Quote

What can you tell me about the XM4? When was it used, by whom, and where?
10/18/2025 9:58:04 PM EDT
[#3]
There’s a whole history and clone thread here on it. Predecessor of the M4, they saw most use late 90’s. Lots of police examples are out there too.
10/18/2025 10:05:12 PM EDT
[#4]
I remember seeing a picture of a gun similar to what you're describing.  Predecessor to the M4.  It had a basic collapsing stock, a short barrel, and a crazy long flash hider.  But I can't remember what it was called.
10/18/2025 10:08:12 PM EDT
[#5]
Found it.  XM177.  Some details here:
https://www.firearmsnews.com/editorial/car15-vietnam-pdw/470350
10/18/2025 10:20:38 PM EDT
[Last Edit: neight][Edited] [#6]
Here ya go

This is the XM4 thread.
Lots of fantastic pics and info here.
10/18/2025 10:39:56 PM EDT
[#7]
Quote History
Originally Posted By OakEngineer:
Found it.  XM177.  Some details here:
https://www.firearmsnews.com/editorial/car15-vietnam-pdw/470350
View Quote

I actually already have an XM177E2 clone. Great little gun. A1 upper.
10/18/2025 10:40:34 PM EDT
[#8]
Quote History
Originally Posted By neight:
Here ya go

This is the XM4 thread.
Lots of fantastic pics and info here.
View Quote

Thanks. My fault, my brain skips over stickied threads. Every time.
10/18/2025 11:01:52 PM EDT
[#9]
Originally Posted By ELittlefield:

Thanks. My fault, my brain skips over stickied threads. Every time.
View Quote


Grab a snack and get comfortable. It’s a gonna be a late night for you bud.
10/19/2025 9:13:07 AM EDT
[#10]
Originally Posted By ELittlefield:
I have an M16A2 marked PSA lower, which is currently a 20" A2 clone. I never shoot it, because I'm not a fan of the configuration, so I'd like to give it new life as a carbine. Were there any carbines used by any units that had an A2 upper, an Aimpoint Comp M2, a 14.5" pencil barrel, and CAR stock with skinny handguards?
View Quote


Also, I like your approach to cloning.  Finding specific parts for a build is hard.  Instead just figure out what esoteric historical gun resembles the gun you already have and BOOM free clone!
10/19/2025 5:56:28 PM EDT
[#11]
Originally Posted By ELittlefield:
Were there any carbines used by any units that had an A2 upper, an Aimpoint Comp M2, a 14.5" pencil barrel, and CAR stock with skinny handguards?
View Quote

Build it however you want and call it and IDF clone?
10/19/2025 6:39:28 PM EDT
[#12]
USAF GUU-5P is the answer. Basically an issued mixmaster made up from whatever parts happened to be lying around. Only rules I've been able to discern are they all have fixed carry handle uppers (A1 or A2, no flat tops) and they all have 14.5in barrels (pencil or M4).
10/19/2025 7:38:27 PM EDT
[#13]
You are almost there on a BlackHawk Down Movie Gun clone. Just need the right carry handle mount (B-Square) and a CAR15 buttstock.
10/19/2025 11:46:07 PM EDT
[#14]
Quote History
Originally Posted By Vegas19D:
USAF GUU-5P is the answer. Basically an issued mixmaster made up from whatever parts happened to be lying around. Only rules I've been able to discern are they all have fixed carry handle uppers (A1 or A2, no flat tops) and they all have 14.5in barrels (pencil or M4).
View Quote

CTPT:  USAF Frankengun.
I wanted a mission, and for my sins, they gave me one.
No rules today, sport…just orders.
It’s not about how many people you kill, it’s about how many you save.
10/21/2025 9:38:05 AM EDT
[#15]
Quote History
Originally Posted By bdgfate:
You are almost there on a BlackHawk Down Movie Gun clone. Just need the right carry handle mount (B-Square) and a CAR15 buttstock.
View Quote
The movie guns seem to have commercial stocks like the bottom gun.
10/21/2025 1:34:59 PM EDT
[#16]
How offensively off the mark would I be if I also added an Aimpoint PRO (mocked up as a Comp M2 with the cap band and extra battery compartment)?
11/2/2025 9:34:49 AM EDT
[#17]
You would be in good company because that's what most guys do.

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