I have the answer, but first, let me sprinkle some pics on you.
The adapter is a simple machined block of metal, a pair of mountings screws, two shims with screws and a small grub screw.
SI has always brought out a lot of value in their products, but I was more than a little skeptical about this one, let me tell you why.
At under $30, it was less than half the cost of most adapters out there. On top of this, I couldn't see how the buffer tube was secured, and it looked like it could be friction fit or any number of terrible attachment schemes.
Some pictures show it with an AR castle nut, and some did not. What they both failed to show is the grub screw on the bottom that helps index and lock down the buffer tube.
The unit shows superb machining with no chatter or tool marks, and no sharp corners. It installed in less time than it took you to read this.
Once the buffer tube is screwed in as far as it can go, you simply back it out until it's properly aligned, tighten down the index screw, and I opted to go for a castle nut for aesthetics and extra security.
The adapter is solid with no wobble. I would have no trouble hammering nails or using the rifle as a bat.
The cheek weld is great when using a simple MOE stock, an Ultimak rail and an Atibal red dot. It looks much lower than it truly is. The only quirk I found was that with the castle nut installed the stock would not lock in the fully collapsed position. I tried a SI Cobra stock and got the same result. Without the castle nut the stocks locked down as expected.
In normal shooting this is a non issue, and would only come up if you run your sling on your stock.
In normal shooting this is a non issue, and would only come up if you run your sling on your stock.
If I could offer feedback on the design ot would be to use a bigger grub screw to index the buffer tube and to make the unit shorter at the cost of the QD sling swivel cups.
This is a great all purpose adapter, it would be nice to see a specialized shorter version for users that already have a sling setup.
This adapter gets a big two thumbs up from me. It does just what you need it to, and it costs less than a pair of good mags
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Ben
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