Other than drilling the float tube for a sling swivel, what are the options for having a two-point sling on an AR with a smooth/non-railed float tube over a low-pro gas block?
I've drilled before on this kind of float tube (sling stud backed by a nylock) but the absence of anti rotation lock means that sling use can unscrew the forearm unless I locktite the tube to the barrel nut (which I hate to do)...
Does the tube that you're using have a jam nut? If so, and you can work the tube loose with sling pressure, the jam nut isn't nearly tight enough. I've found with the 2 that I have that a bit of coaxing with a small hammer on the jam nut spanner ensures that the tube isn't going anywhere without the use of a spanner and hammer once again. Just a couple taps with the hammer for about another 1/8 to 1/4 turn after tightening with the spanner alone will suffice. It won't hurt accuracy and won't damage anything. I would put a bit of anti-seize grease on the threads.That's what I usually do, but if I index the stud on the bottom centerline then the tube can unscrew from the barrel nut as I cinch the carry strap tight (use as a hasty sling). I can mitigate that by indexing the stud more on the weak side of the forearm or by using blue locktite on the tube threads, but that creates its own set of issues.
I was just looking for alternatives. Thanks to all for their inputs.