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Posted: 3/27/2006 2:28:27 PM EST
I just got my ISMI spring from C4 Grant.

www.gandrtactical.com/ismi.htm

Ordered the carbine one, but it's about 11.75 inches. My old carbine one that came with the adjustable stock is like 10.5". Is this normal?
Link Posted: 3/27/2006 3:33:29 PM EST
Nobody?
Link Posted: 3/27/2006 3:38:56 PM EST
It should be. Ask C4i Grant
Link Posted: 3/27/2006 4:03:30 PM EST

Originally Posted By M4A1OwnsYou:
I just got my ISMI spring from C4 Grant.

www.gandrtactical.com/ismi.htm

Ordered the carbine one, but it's about 11.75 inches. My old carbine one that came with the adjustable stock is like 10.5". Is this normal?



I believe the Military gives a range for the acceptable lengths of an A2 and Carbine spring and anthing under 12 is fine for a Carbine I believe.
Link Posted: 3/27/2006 4:41:18 PM EST
You old one might have compressed from it's "new" length to it's current "used" length.

I measured mine new and wrote it's length on the buffer so I know where it's length started.
Link Posted: 3/27/2006 4:53:11 PM EST
[Last Edit: 3/27/2006 4:53:19 PM EST by M4A1OwnsYou]

Originally Posted By JumboJim:
You old one might have compressed from it's "new" length to it's current "used" length.

I measured mine new and wrote it's length on the buffer so I know where it's length started.



that's possible. Keep in mind though, I only fired about 200-250 rounds through it.
Link Posted: 3/27/2006 4:56:08 PM EST
It depends on the wire diameter and number of coils and the spring rate. 2 springs that do the same thing can have different lengths.

5Shot
Link Posted: 3/27/2006 6:49:02 PM EST

Originally Posted By 5Shot:
It depends on the wire diameter and number of coils and the spring rate. 2 springs that do the same thing can have different lengths.

5Shot



Alright thanks.

C4 said it was fine as well.
Link Posted: 4/15/2006 12:14:58 PM EST

My original buffer spring had worn down to the point that on a full mag(28rds) w/ open bolt, slapping the bolt release, the bolt would not fully slam home.

I got one of those ISMI springs, but then the rifle was short stroking like crazy, even w/ Q3131a and XM193 ammo!! The ISMI spring was noticably longer. Keep in mind, I did have a H2 buffer in there.

I ordered a new factory buffer spring and it runs 100% again. The new factory spring length(DPMS) is in between the ISMI and the old spring...

FYI, YMMV.
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