weak buffer spring

[xnv733x]

i just finished a new build i purchased a milspec ctr stock assembly for it i thought it was odd that the when i purchased it i was given the tube, spring , and buffer in a ziploc baggy after assembling i noticed that when i pulled the charging handle the spring felt weak and failed to fully push the bolt all of the way forward several times iv never experienced this with any of my other builds has anyone else had this problem

[pyro3k2]

Buy a new buffer spring, they are very cheap I got mine from midway usa for $3.99, could always buy some ammo from them while you are at it .

[ar15barrels]

Pull the spring out of the stock and check the free length.
A new carbine spring should be 11.25" long.

[luckystrike]

do some stretchin

[Gio]

do some stretchin

That's what she said

-Gio

[Trendkill]

Did you let it fly back...or did ya ease it forward...???

[xnv733x]

yes i let it fly

[CCTACTICAL]

These are great springs!! http://www.davidtubb.com/tcom_images...cs_buffer.html

[ar15barrels]

do some stretchin

nope.
throw it away and replace it if it's more than 1" under spec of a new spring.

[ar15barrels]

after assembling i noticed that when i pulled the charging handle the spring felt weak and failed to fully push the bolt all of the way forward several times

If you retract the charging handle and release it, it's common to have the bolt fail to go into battery, especially if the upper is not lubed properly.
Pull the charging handle back, engage the bolt catch, return the charging handle forward, insert the loaded magazine and depress the bolt catch to let the bolt carrier move forward.

[CCTACTICAL]

If you retract the charging handle and release it, it's common to have the bolt fail to go into battery, especially if the upper is not lubed properly.
Pull the charging handle back, engage the bolt catch, return the charging handle forward, insert the loaded magazine and depress the bolt catch to let the bolt carrier move forward.

[ar15barrels]

A full magazine will also cause a problem.
Download one round to give the other rounds in the mag room to move down while the top round comes "around the corner" into the chamber.