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12/16/2007 2:47:12 PM EDT
Took my Colt AR out to shoot today and on the second magazine it failed to eject a spent casing. The bolt retracted far enough to strip a new round from the magazine, resulting in a sort of double feed. Rifle has <300 rounds through it and was running Remington UMC. Not meaning to bash Colt, just looking for ideas. I'm pretty new to ARs. Underpowered round maybe?
12/16/2007 9:50:35 PM EDT
[#1]
One time event or constant problem?

As for underpowered ammo, is the ammo locking the bolt back after the last shoot from the mag has been fired?
12/17/2007 8:43:23 AM EDT
[#2]
WWW.MCMASTER.COM
#60 O-RING  4 THE EXTRACTOR SPRING


CLEAN
OIL
ECT



O-Rings, Cordstock, and Accessories
5 products match your selections
AS568A Dash Number 006

Type O-Ring
O-Ring Type Standard
Cross Section Shape Round
System of Measurement Inch
Width 1/16"
Inside Diameter 1/8"
Outside Diameter 1/4"
Specifications Met Military Specification (MIL)
ASTM Specification ASTM D2000
SAE Specification SAE J200
MIL Specification
MIL-P-25732 | MIL-P-5315 | MIL-P-83461 | MIL-R-25988 | MIL-R-83248C
Material — Material comparison chart
Buna-N
Good oil resistance.

Viton
Excellent weather, synthetic lubricant, chemical, and hydraulic fluid resistance.

Fluorosilicone
Resists petroleum fluids.
12/17/2007 12:14:23 PM EDT
[#3]
This was the 1st and only time this happened. The bolt has locked back at the end of every mag. I clean the rifle after every session; however, I might not be oiling it correctly.

Should an o-ring have come with the extractor or is that an aftermarket enhancement?

Thanks.
12/18/2007 12:28:52 PM EDT
[#4]

Quoted:
This was the 1st and only time this happened. The bolt has locked back at the end of every mag. I clean the rifle after every session; however, I might not be oiling it correctly.

Should an o-ring have come with the extractor or is that an aftermarket enhancement?

Thanks.


After market, and may be more of a band-aid for other problems than an enhancement depending on the application of why it is being added.
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