View Single Post
Old January 30, 2013, 12:30 AM   #21
Hummer70
Senior Member
 
Join Date: June 22, 2009
Location: South Carolina
Posts: 133
The striker indents appear to be wanting to reverse flow. Normally the M16 requires a very hard striker indent to reliable ignition which comes with deeper fired primer indents. If the hammer spring is not up to spec the pressure rises, allowing the striker to head in the other direction. I had this bad on my 7615 and checked the striker energy and it was too low. I replaced the hammer spring with new Wolf spring and the indents now look correct.

This is normally tested by measuring the depth on a pressure copper in a copper holder that looks similar to a headspace gage. The SAAMI standard for 223 now is .016" indent depth and was .020". The M16 spec calls for .022" indent. The hardest primer to ignite in US inventory is Cal 50 followed by primers for 5.56MM.
__________________
Distinguished Rifleman High Power & Smallbore Prone
President's Hundred (Rifle) US Palma Teams(2)
US Dewar Team (2),4 Man Natl.Champ Team SB Prone
Cert Test Dir. Sm Arms and Ammo,Aberdeen Pr Ground, Firefighter I, AC4HT
Hummer70 is offline  
 
Page generated in 0.03574 seconds with 7 queries