Instruction: Evaluate the answerability of a question by analyzing the related document, outputting yes if the document contains information addressing the question, and no otherwise.

Input:
Question: How effective would this be on a 223 platform (ar15) without the lead weights?
Document: I just purchased the Caldwell Lead Sled DFT on Amazon. I wanted to use it to sight in an AR 10 style rifle with a PMAG 20 LR 7.62x51/ .308 20 rd. magazine. The problem is that these .308 Magpul magazines will not fit between the 'dual frame' rails! They are too close together and there's no way to adjust them further apart. Why would they design this product to only work with 223/556 magazines?
I like the way you can set elevation and how solid it is with lead weights put on the tray.It makes the perfect base for sighting in my high powered rifles, I know I will get many years of use out of it and will be passing it down to my children.
You'll be amazed at how much better you shoot without recoil (and another great reason to shoot a lot of rimfire, too. )THE BETTER - This particular Lead Sled DFT rest is not only built like a brick outhouse, it has the adjustability of the more expensive front benchrest rests. You slide and lock the distance from the front to rear supports with a double cam on a double rail. This means almost any sporting rifle will work fine.
I love my lead sled! I've used it twice now and have had no problems with it. Fortunately I'm very mechanically inclined so putting it together took about 10 minutes. It's very sturdy and stable. Nonetheless, it still hops a little when I shoot my .300 win mag. I just bought two 25lb lead shot bags to see if it stops the hopping. It's a bit big and bulky to put into closet easily. Overall, glad I bought it and would buy it again.
This lead sled does an incredibly great job of reducing recoil! I was sighting in my new 12 gauge w/ scope and got to the point where it hurt too much to shoot. I ordered the DFT and received it three days later. I loaded the sled with two 25 lbs bags of lead bird shot (the Caldwell weight bag isn't necessary) and couldn't believe how effective the sled was. The vertical and horizontal adjustments work well. Breathing and holding are no longer an issue.
Without weight, the sled does fine for my bull barrel rifle. With weight, it is rock solid. I added a pad to protect the wood stock, but not really sure it is necessary. I am now sighting in my gun, not measuring my hold.
Great should have bought this sooner it worked great looks great and is made out of good material would recommend to anyone.
I have them stored in a sandwich bag. While I may never need 'em, it would be nice to have a small pouch attached to the rest to keep 'em in. No biggie. Great Rest...get yourself one!
With multiple adjustments on this unit, they left no stone unturned. The product came partially assembledand finishing the assembly was an easy task. I find that weights are not needed in medium weight caliberrifles like the 5.56. With 30 caliber the sled is going to move a bit but quick re-sighting is no problem.
A lot of people use these at our range (well) and just work around the following problems:Difficult for left handed (eyed) shooters to adjust rough elevation screws without standing up.Even with a lot of weight it still shifts back on a cement bench and, for other reasons, you still have to readjust (to some degree) back to point of aim between shots.Still, this is better than a couple of sandbags.
Answer: yes