07-17-2014, 04:11 PM
This is no real help, but FWIW...
I think the reason that many handguards are ~12.5" to ~12.6" is because it's the appropriate length on barrels with rifle-length gas and exposed gas block / front sight. From a manufacturer's perspective, this length will have more appropriate applications over a 12" or 13" rail, and theoretically more sales potential.
If I had a new handguard design to bring to market, with limited funding thus requiring that only one length be manufactured in the initial run, I would introduce it in ~12.5" length. It could be used appropriately with barrels from 14.5" to 24".
I think the reason that many handguards are ~12.5" to ~12.6" is because it's the appropriate length on barrels with rifle-length gas and exposed gas block / front sight. From a manufacturer's perspective, this length will have more appropriate applications over a 12" or 13" rail, and theoretically more sales potential.
If I had a new handguard design to bring to market, with limited funding thus requiring that only one length be manufactured in the initial run, I would introduce it in ~12.5" length. It could be used appropriately with barrels from 14.5" to 24".
Drifter