The A1 Birdcage flash hider replaced the 3 Prong on all M16 rifles in 1967, and continued to be used until final replacement by the A2 version in 1983.
The "Extended" version is a slightly longer version of the regular A1 Birdcage. Use to increase flash suppression performance, or to slightly increase the overall length of your barrel if you are just shy of what you need.
Can also be used where ever an "HK" flash hider look is preferred, since this is quite similar in size/appearance to the German original.. but in 1/2 x 28 thread pitch.
- 1/2 x 28 standard 223/5.56 AR threads