The 7.62x51 NATO (.308 Winchester) PMAG 25 M118 LR/SR GEN M3 Window is now compatible with M118 LR ammunition with a max OAL of 2.830". This is a lightweight, cost effective, high reliability magazine for SR25/M110 pattern rifles featuring true 25-round capacity, constant-curve body, anti-tilt follower, snap on Impact/Dust Cover, and features transparent windows to allow rapid visual identification of approximate number of rounds remaining. Please note that this increased length capacity means that the PMAGA(R) 25 M118 LR/SR GEN M3 Window may or may not drop free from some models of weapons. However it can still be pulled free." Mfg: Magpul