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Posted: 5/23/2008 4:32:09 PM EDT
| I just put together a 7.5" upper in .223. About every 5th round it will fail to extract the round from the chamber and the next round is jammed behind the spent round in the chamber. I am thinking the bolt/carrier is moving rearward before the brass cools and can be extracted. I am using an M4 stock and buffer. On Del-Ton's site I found this www.del-ton.com/CAR_Buffer_Counterweight_p/bs1050.htm. Is that what I need? |
Have you upgraded your extractor? D ring- o ring or heavier spring. Try that, my 7 1/2 runs great with a stock buffer and spring, all guns are different so you might need to experiment a little. You will know if you need a heavier buffer after adding the extractor parts because it will launch the empties into the next county  or sometimes even pull the base off the case. The AR is a very easy operating system study how it works, then start at the beginning of the cycle and work your way back to troubleshoot any problems.What type of ammo are you shooting? What brand of upper components? Lower? |
No I haven't upgraded the extractor. Ammo is 54gr tracers, 24.5 gr BL C2. Works fine in my M4 and varmint upper. Upper is a keyhole upper and bolt/carrier from Del-Ton. Barrel and gas tube are from Model 1 Sales. Lower is DPMS. Where can I get the parts to upgrade the extractor? |
Do you just put one on top of the spring? |
Remove extractor, place ring over the spring with spring sticking through center of o-ring, and re-install extractor.... you'll need some thumb pressure to align hole for the pivot pin to slide back into place. |
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O-Rings, Cordstock, and Accessories This product matches all of your selections. Part Number: 1201T16 $4.82 per Pack of 50 AS568A Dash Number 006 Type O-Ring O-Ring Type Standard Cross Section Shape Round Width 1/16" Actual Width .070" Inside Diameter 1/8" Actual Inside Diameter .114" Outside Diameter 1/4" Actual Outside Diameter .254" Material Viton Viton Type Standard, Military Specification Durometer Hard Durometer Shore Shore A: 75 Temperature Range -15° to +400°F Color Black Specifications Met Military Specification (MIL) MIL Specification MIL-R-83248C SAE Specification SAE J200 ASTM Specification ASTM D2000 http://www.mcmaster.com/  © 2008 McMaster-Carr Supply Company. All rights reserved. |
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