How do I know which model of PWS firearm I have?

Our MK1 and MK2 MOD 0 firearms feature a quad rail and were made through mid-2015. MK1 & MK 2 MOD 1 firearms feature a KeyMod rail with forward assist.
MK1 & MK2 MOD 1s were updated in 2016 to MOD 1-Ps which still had KeyMod rails, but did get some upgrades like our Enhanced Buffer Tube with Ratchet Lock Castle Nut & Endplate; the MK2 MOD 1-P did not have forward assist. MK1 and MK2 MOD 1-Ps were replaced in 2018 with MOD 1-Ms featuring a MLOK handguard, and is what we currently produce.
The MK1 MOD 2 was released in 2016 and features a PicMod handguard, eliminated forward assist and an ambitious lower. The MK1 MOD 2-M replaced the MK1 MOD 2 in 2018 and features a PicLok handguard.
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