It means the direct relationship the color pigmintation has on the display.
The direct impingement system requires a fair amount of maintenance. Gas piston uppers have problems with carrier tilt. The 5.56x45 cartridge isn't as powerful as the larger caliber cartridges it replaced. The aluminum used in the receivers has a lower melting point than steel.
none, it's when you shorten the gas system that causes out of battery problems.
Try AR15.com Try AR15.com
If it is one of the recent Colt .22LR AR15 rifles, then the answer is no - they are completely different internally.
First do a full functional clear, eject the mag, rack the bolt/carrier to eject any casing. Next fully clean the gun. Check for broken or weak parts in bolt/carrier, gas system, and buffer system. Use quality ammo. If it still doesn't then take the gun to someone who knows how to work on ar15 rifles.
Yes
1959
The US Army presently uses the M4 carbine, a shorter and much modified version of the Armalite AR15.
Colt has not offered a AR15 in 308
By it's serial number. Go to www.proofhouse.com and under 'long rifles' listing look for AR15 Sporter
Its ar15