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Posted: 10/3/2004 8:24:24 PM EST
If I understand it correctly, the A2 stock is longer (1 inch?) than the old A1. Also, the very early M16 stocks had no trap door, whereas the later A1s did.

I'm "restoring" an old SP-1 on which the last owner had installed A2 handguards and stock, as well as some aftermarket type pistol grip. I've already put the A1 triangular handguards on and they look great. I've ordered an A1 style pistol grip too.

I'm planning on getting an old A1 or pre-A1 buttstock and need to know if my existing buffer tube, etc. will work with either stock. I'm thinking, since the older stock is shorter, there might be a problem.

Thanks.
Link Posted: 10/3/2004 8:29:45 PM EST
They all use the same buffer tube. When you remove the A2 stock you'll find a plastic spacer behind the buffer tube. Just leave that out and it'll all fit fine. Also, make sure yo either get the correct screw or cut the existing one. The screw near the top of the buttplate threads into the bacl of the buffer tube. If you use the longer A2 screw with a shorter A1 stock it can prevent the buffer from going all the way to the rear.
Link Posted: 10/3/2004 8:31:59 PM EST
They use the same buffer, spring and tube. A2 is 5/8 longer, and uses a longer screw and a spacer. You just need the stock and shorter screw.
Link Posted: 10/4/2004 2:21:29 AM EST
Link Posted: 10/4/2004 3:51:15 AM EST
Thanks guys.

That's exactly what I needed to know.

Link Posted: 10/4/2004 5:51:56 AM EST

Originally Posted By Chuck:
The M16A1 stock has the butt trap and is the lightest of the three fixed stocks. ....


I have not measured an M16 stock (though one of the MD-AR15.com site members has), I have weighed the others. Results of my weighing are as follows:

(includes receiver extension, buffer & spring, and buttplate appropriate to that model)
M16: 22.7oz
M16A1: 25oz
M16A2: 24.5oz
Cav Arms C1 : 20oz (with included buttplate - 22.7oz with A2 buttplate)

Surprisingly the M16A1 weiged more than the M16A2 even though the newere stock is longer and has the spacer (probably due to the improved materials of the newer stock).

The C1 is the lightest, has the most storage space, and is the same length as the A1.

Link Posted: 10/4/2004 8:34:30 AM EST
One advantage of the oldest M16 buttstock is that the rubber buttplate does not make much noise when grounding it against hard surfaces like concrete. Another is how it sticks to the shoulder better than the hard plastic checkering of later versions. YMMV.

Paladin
Link Posted: 10/4/2004 2:26:30 PM EST
Link Posted: 10/5/2004 5:46:20 AM EST

Originally Posted By Chuck:
On a postal scale. Stocks and sling swivels only, no lower receiver extensions, buffers, springs (they're all the same):

XM1E1 11.3 oz
M16A1 15.5 oz
M16A2 14.7 oz including the spacer.



Cool, were seeing similar results (though I'll bet your scale is more accurate than my food scale).
Link Posted: 10/5/2004 12:59:21 PM EST
Damn, I wasn't aware that the original one was that much lighter. I will have to look for one of those...
Link Posted: 10/5/2004 2:21:49 PM EST
They have no storage area for your cleaning kit, so you can subtract that weight also.

Paladin
Link Posted: 10/5/2004 2:59:51 PM EST
Link Posted: 10/8/2004 6:43:23 PM EST
Right on the money.

I installed the old "no-trapdoor" M16 buttstock and it looks perfect.

Used the shorter early-type stock screw, put the plastic spacer aside, and everything lined up just right.

Thanks!
Link Posted: 10/9/2004 4:00:14 AM EST
Link Posted: 10/10/2004 11:57:06 AM EST
Very logical tip; thanks.

And yes, I did use the short screw!
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