Anyone who knows Oly's K9GL know if .223 forearm rails such as the...
THX in advance
While I haven't checked and I'm waiting to get an Oly/Glock lower, I can't see any reason why they wouldn't. Basicly the lowers have reworked mag catches, Boltlockbacks and a magwell insert/slight different machining. The front of the magwell is the same as a standard AR lower. The upper is the same with the exception of a small slot cut in it to allow the mag catch to come up. It's no where near the front end of the upper.
I have a standard Oly 9mm carbine upper that is awaiting an Oly/Glock lower and it wears a YHM freefloat handguard just fine. The reason I went with a freefloat handguard is because as soon as I get the lower fialized, it will become an 5" SBR with a can on it.
The short answer is............. yes it will fit.