Instruction: Output yes if the supporting document can answer the given question. Otherwise, output no.

Input:
Question: My Umarex Beretta PX4 pellet/BB pistol uses a 16 round rotary magazine (8 rounds on each end). Can this BB Speed Loader be used with this gun?
Document: I got this for a Model 92 Beretta style BB pistol that I got to practice with in the garage or basement. It really faciitates reloading the 19(?) BB clips that are used by this pistol. Handling those tiny BB's is a bit of a pain - I'm not as dexterous as I used to be!! I marked it down because sometimes the plunger jams when pressing it down to insert the BB's in the clip and you have to fuss around a bit with it.
You do not have to lower the spring in the magazine, the speedloader just pushes the bb's right in.After loading the pistol I went to load the rifle (It just has a 3/8 inch hole in the side to drop bb's into) , I took the adapter off the speedloader and just put the loader against the hole and pressed the plunger and bb's went right into the rifle's reservoir.
I'm fairly patient and realized the loader needed to be held at an angle and shook frequently, but it still jammed continually and the plastic plunger broke very easily. Should have been made much more durably. This came as part of my MP-5 BB gun and looked promising to fill the 40 round magaizine. Turns out a simple straw works better.
Should have read the other reviews more carefully. I bought this not knowing it was absolutely terrible for a speed loader. I've used airsoft speed loaders before that dispense bbs efficiently but this thing jams all the time. totally worthless. Don't waste your money
Pros: holds many BBs, makes it easier and quicker to load the BB Gun magazine.Cons: Jams easily. The lid doesn't stay closed and latched. I had to use a piece of tape to keep it closed.
Using this loader, caused excess wear on the magazine. After a few loadings, the catches on the end of the magazine become loose and will not hold the BB's any longer. Renders the magazines useless.
My plan is to use this as advertised: for steel BBs in multiple BB/Pellet guns. I read the reviews and took them into consideration, but I had no idea how accurate they were until I used it for myself. After trying the product I can say that I generally agree with the reviews, but I have no idea how long I can keep it working since I've only had it a few days. The manufacturing and design standards are below par, as far as I'm concerned.
So I put the adapter for my pistol (it comes with four adapters for various pistols) on the speedloader, filled it with bb's, held my magazine against the bottom of the loader and pressed the plunger (you have to press it pretty hard, but do not try to force it if it feels jammed) and the bb's went right into the magazine, about 5 or 6 at a time.
After reading the reviews, which were mostly not very favorable, I figured I would give it a try anyway since loading my pistol and rifle took so much time. I have the Umarex Smith & Wesson M&P; pistol and the Crosman M4-177 rifle.My speedloader came factory sealed in a package that you have to cut to open.
Umarex should be ashamed to sell such a poor product. After using it (or attempting to) for many magazine reloads I find that it jams much more often than it loads. I am only surprised that I have not broken the plunger yet. When it works, which is rarely, it loads well, unfortunately that is not often.
Answer: yes