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Discussion Starter · #1 ·
I am interested in a light weight AR and have narrowed my choice to the Colt Government Carbine and the Bushmaster Light Weight. Both are flat-tops and have the "thin" 16"barrel. I have "real" battle rifles and AR-15A2's, but I am looking for a light carbine for younger and smaller family members.

My specific question is whether the current Colts are still goofy or not? What I mean is, do they still have the sear block, different pin sizes, etc.? Does this even matter? My only concern would be whether spare parts for my other AR's would fit in a current manufactured Colt or are there considerable differences.

I'm not interested in any of the Bushy Carbon 15's and at this point I'm not concerned about the price difference b/w the Colt and the Bushy. Also, are the light weight (i.e. thin barrel) AR's that much lighter than say an AR with an M4 profile barrel?

Thanks everyone, any advice is much appreciated.
The Gator
 

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Yes they have the larger trigger/hammer pins and sear blocks. Get the Colt and one extra pin. You'll be happier.

BTW why the concern on the sear block? I dont see why people get hung up on stuff like that unless they have a DIAS.
 

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Discussion Starter · #3 ·
Thank you, TaylorWSO -

I'm not concerned about a sear block other than whether or not it prohibits the use of "mil. spec" parts like my other AR's. Are you saying that the only non-standard parts on the Colts are the pins you mentioned? I thought that I read somewhere that the front sight post is a different size for some reason. I appreciate the input.
 

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The Gator said:
I thought that I read somewhere that the front sight post is a different size for some reason.
IIRC, Colt uses a different front sight base for flattop receivers, so that the front sight doesn't have to stick up so high with removable carry handle. Trying to remember the details but I'm not sure about it--maybe someone else has better information.
 

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Snake45 said:
The Gator said:
I thought that I read somewhere that the front sight post is a different size for some reason.
IIRC, Colt uses a different front sight base for flattop receivers, so that the front sight doesn't have to stick up so high with removable carry handle. Trying to remember the details but I'm not sure about it--maybe someone else has better information.
Actually, the F-marked front sight base is taller than the standard unmarked front sight base. The detachable carry handle's rear sight is placed higher than the equivalent A2 rear sight due to the height of the Picatinny rail. The flattop's rail was slightly raised during its development as the original cross cuts excessively thinned the top of the receiver. Dick Swan (ARMS) demonstrated this point to Colt employees by using a sharpened pencil to poke a hole in an early prototype flattop receiver.

P.S.: Not all AR-15 clone manufacturers use the raised front sight base with their flattop rifles/carbines.
 

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Thanks, DW, that's what I was trying to say. With a standard FSB on a flattop, you often have to screw the front sight so far out that it's flush with the top of the protective ears. I've had it happen myself. Had to solve the problem with an offset-drilled rear sight aperture to get a normal looking sight picture.

AFAIK, Colt is the only one who has a special FSB for this. All other mfgrs just use the standard FSB for everything. But perhaps you know more than I do about this.
 

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If you're worried about the front sight, RRA offers a taller (~0.040" if memory serves) front sight post that works with a standard FSB. Unscrew the old post and screw in the new one, then zero.
 

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deltaheavy said:
If you're worried about the front sight, RRA offers a taller (~0.040" if memory serves) front sight post that works with a standard FSB. Unscrew the old post and screw in the new one, then zero.
Yah, but that doesn't solve the problem--the front sight post still sticks up too high. Makes for a weird sight picture, for one thing, and then the post itself doesn't get much protection from the ears.

I got a pair of offset rear peeps from a vendor on AR15.com. I think it was R-B Precision, and about $7 each. These have the peep holes drilled .040 lower than normal, allowing you to crank the front sight post down that much or more. Not a perfect solution, but I can live with it.
 
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