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Old 04-24-2014, 08:50 PM
Greg Ficklin Greg Ficklin is offline
 
Join Date: Oct 2009
Location: South Carolina
Posts: 594
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Standard sling swivels are part of the front sight fixture that is pinned to the barrel. Sling tension on a standard front sight sling swivel applies pressure to the barrel. The reason people have problems with zeros with this is because they don't have the forward elbow under the rifle, and tension pulls it left, or inconsistent tension allows it to go side to side. This is also true for NM rifle shooters too. Any inconsistency will cause wandering zeros, and many will blame the lack of a float tube when in fact it could be anything that isn't consistent from shot to shot. Let me make this perfectly clear. You do not need a float tube to clean the prone slow, or rapid fire at 200 yards.
What you need is a good position with the forward elbow under the rifle. This is the hardest thing for people to learn on their own. Extend the forward arm, and set the elbow deep under the rifle as if you are trying to get your armpit on the deck. When this is done correctly, your upper arm will be mostly flat on the deck, and the weight is not on the point of the elbow, but on the side.
You don't need one but, a quad rail is a float tube. They are attached the same way as NM float tubes. A quad rail is a float tube without the handguard, because the handguard is the tube. The CMP isn't considering the quad rails as float tubes, based on the ruling that you can have your sling swivel attached to the handguard. This suggests that they are calling a quad rail a handguard, and it is.
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