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

Input:
Question: does it work on a Spyder MR4?
Document: Make sure you check your feedneck and I thought this was able to fit my 2012 Fenix but it has no threads. They should emphasize that it has no threads so it is harder to make this kind of mistake. Other than that I'm sure it would work great on threadless feednecks. Build quality also looks good.
Fits tell onmy my Spyder Extra. I kinda had to jimmy rig it but it ended up working! all and all it was a good buy
Needed a feed neck, bought this, fit both my hoppers and seated perfectly in my Spyder Pilot (Old school light blue, not ACS).
Well, first it took about 2 weeks longer to get here than it was supposed to, and second they sent the wrong item, the rap4 clamping feedneck, instead, which doesn't even fit my spyder pilot acs.
Can't properly tighten this onto marker without scratching. The quick release bulges out too much and is in the way. Just thought to myself if I can remove the Quick Release first... Anyways, the "Ears" are also too small for my Spyder, it does not sit well and turns.
Replaced my Spyder Rodeo feedneck. Accepts my electronic feeding hopper perfectly. The clamp is a little tight, but I prefer that over it being loose. I tried to jerk my marker around with the hopper attached to get it to fly off, but this feedneck clamped on steadily with no slippage.
I tried three brands (Spyder, Rage and ViewLoader) with the same result. Need to use electrical or Teflon tape on the feed tube to secure it.4. the quick release is hard to open, and feels gritty.I gave an extra star because I can send it back for a refund.
Even though my gun was listed under those the neck fit, Spyder Victor..... It does not slide on. I've tried numbers of times to contact them, through email, and 4 times through phone, it just hangs up on me when I hit 0 for the operator, when it says to hit 0. So I'm not sure how I'm going to send it back, or if I'll get a refund...:(
I gave this only 2 stars for several reasons:1. It is a chalky flat black, not gloss as shown in the picture.2. It does not fit my Spyder Imagine (or Fenix) that it is advertised for. I would have to shave 1/16 from the outside diameter and over 1/16th from the end, plus shave down the tabs before it would be usable, and still not good.3. The quick release is not tight enough to hold the hopper securely.
This feed neck looks awesome and it beats the original feed neck on my spyder pilot (old version) by a long shot. Before I needed to use this stupid plastic feed neck extender/adapter that the gun came with to use irregular hoppers like electric ones because if it didn't slide OVER the feed neck (not into) you needed the adapter which added ~ 3 inches of height to the gun. Now any size hopper will fit securely as high as it would with a regular feed neck.
Answer: yes