Please email us at techsales@opticsplanet.com regarding your question with the Texas Weapon Systems AKM/AK-47/AK-74 Gen-3 Short Top Handguard.
If it's a flat gastube like on unmodified saigas, it'll work. But if it's a tube that can accomodate a wooden/plastic guard, there won't be enough clearance for the rail to go on. I found that the tubes they send you to get pretty hot, faster than my stock saigas. Perhaps, I'm wrong, and it's just me. Hot is hot either way, lol. I just tossed their tube in a bin of obscurities and called it a day.