at 1500 rds -sping died[greased with moly] and end of buffer hit and marks on the bolt carrier !so whats life of a recoil spring ?
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at 1500 rds -sping died[greased with moly] and end of buffer hit and marks on the bolt carrier !so whats life of a recoil spring ?
Depends on the quality of the spring. A standard $5 USGI spring will of course work forever. If the spring does not have enough tension to strip a round off of a full 30rd mag then it is spent.Quote:
Originally Posted by cz7
A good test is to lock the bolt back, insert a 30rd mag and hit the release. Did it strip a round off and properly seat into the chamber? If so, then it is stil good.
I personally do not want to wait to find out when the spring goes down, so I typically change out all the extractor springs and buffer springs at around 3-4K. I also use ISMI CS springs. These springs have a MUCH better life than a standard spring and will noticeably alter felt recoil.
C4
ISMI shot peened, stress relieved, heat treated buffer spring
http://www.gandrtactical.com/images/...I/DSC02282.JPG
SS spring after about 8k and a new SS spring and a new ISMI spring
http://www.gandrtactical.com/images/...%20springs.JPG
well went to a class-3 dealer show the spring -showed a new one [g.i] opps almost 2.75 shorter .said i shot many more in a 20'' barrel and never seen this happen -the buffer hits the rear of the tube and marks the buffer nylon part !he send the bolt is working faster so more things will work harder than a 20'' so an aac -ss buffer kit this is the best way to fix all the troubles you have ,anyboby have the same with recoil spring/buffer like bolt/buffer slamming and groups going wild ??
so is a CMT spring a good quality one? Who is USGI?
:DQuote:
Originally Posted by ar_mcadams
Sorry.....I had to.
Quote:
Originally Posted by ar_mcadams
The CMT springs are your standard $5 dollar SS spring. They are what the Military would use. Does that mean it is a quality spring? Yes it does. Is it the best choice out there? No it isn't.
C4
If it is shorter than the minimum length (in inches), it needs to be replaced. If it's getting close, it probably needs to be replaced. If the minimum were not good enough, it would not be the minimum.;)Quote:
Originally Posted by Pat_Rogers
[This was posted in the tacked extractor/O-ring thread.]
ETA: Grant-How long is the spring with 8K on it which is posted above?
I have never heard of ISMI before.
Most have not. They make springs for 1911's, Glock's, mag spring for just about everything. They use the highest grade CS available and then shot peen, stress relieve, heat treat and gurantee their springs for one year!Quote:
Originally Posted by ar_mcadams
They are one of the best kept secrets in the industry and I use their products on just about every weapon I own (1911, Glock, AR).
C4
The rule of thumb i have heard (not sure if it's relevant or not) is once a recoil spring loses two coils in stack height, it ought to be replaced. The only way to verify this is to have a 2nd good spring to compare it to.
Anyone else ever heard this?