727/M4 stocks
Top: 727 w/"fiberlight" stock & 2 position tube
Bottom: M4 w/later stock & 4 position tube.
The "fiberlight" stock is the 4th type carbine retractable stock & was used on the 723 thru early M4's, the 2 position tube was used on the 609 (XM177) thru 727, the M4 used the 4 position tube. The stock on the M4 replica in the pic is the 5th type retractable stock & superceded the fiberlight in M4 production.
Bottom: M4 w/later stock & 4 position tube.
The "fiberlight" stock is the 4th type carbine retractable stock & was used on the 723 thru early M4's, the 2 position tube was used on the 609 (XM177) thru 727, the M4 used the 4 position tube. The stock on the M4 replica in the pic is the 5th type retractable stock & superceded the fiberlight in M4 production.
Other Sizes: Original