The M4 is getting a signature attachment and it's a grenade launcher (noobtube)

Except for the first delivery order, all U.S. military-issue M4 and M4A1 carbines possess a flat-top NATO M1913-specification (Picatinny) rail on top of the receiver for attachment of optical sights and other aiming devices Trijicon TA01 and TA31 Advanced Combat Optical Gunsights (ACOG), EOTech 550 series holographic ...

1 To make regular nouns plural, add s to the end. cat  cats. house  houses. 2 If the singular noun ends in s, ss, sh, ch, x, or z, you usually add -es to the end to make it plural. iris  irises.

First-person possessive pronouns are used to represent something that belongs to you. They are mine (singular) and ours (plural). They are closely related to the first-person possessive determiners my (singular) and our (plural).