08-21-2011, 08:32 PM
LRRPF52 Wrote:Sounds to me like a weak ejector possibly. Push down on your ejector plunger. It should resist your force significantly. That is odd to have a 1:30 ejection pattern. 3:00 or thereabouts seems more common if your upper has a brass deflector, as most do. Different charge weights and operating system balances will produce different patterns, but an ejector can make the biggest influence on whether the spent case clears the ejection port or not. Since you had a case left on top of the magazine, that indicates to me either an ejector or extractor issue, but since it was extracted, that points more to the ejector.
Give us a break down of your rifle's components, to include barrel/gas system length, bolt carrier weight, recoil spring and buffer types (weigh the buffer if you have to), adjustable gas block or not, and cartridge components, to include charge weight and bullet type/weight.
I'll try and answer your questions as best I can:
Ejector and extractor both look as expected with good spring tension.
Receiver is a YHM w/brass deflector.
YHM upper w/16" AA barrel and a mid-length gas system, non-adjustable.
The bolt carrier weights 9.0 oz w/o bolt and 11.0 oz w/bolt
The buffer weights 3.0 oz.
Spring and buffer type? Don't know, I'm not familiar with different types.
Buffer spring is 10" long and 7/8" dia.
Last time out shooting I had my first Grendel reloads.
Lapua Brass, Rem. 7-1/2 Primers, H322, Sierra Pro-Hunter 120g's
Lightest load 23.5g
Heaviest load 25.5g
I've also shot both AA and Hornady factory ammo.
I've had this problem with all ammo, but more often with the reloads.