AK ION 11.5" Lite MLOK - A
AK ION 15.4" LITE MLOK - M90/77
15.4" hg will extend 15.9"from receiver (HG covers all of barrel except for muzzle threads)
M90 railed gas tube uses extended tang to hold gas position. Much more secure as there are many reports of broken leaf springs on the OEM tubes .
M90 gas tube also fits M77