Prometheus Smooth Air Seal Chamber Hop-Up Bucking For Airsoft AEGs (Model: 40 Degrees)

"I used this purple bucking with the Fire Fly Namazu to "Flat Hop" my VM4A1 KWA.
I'm impressed.
.36s on a single size up grade spring to an M130.
Previously, was dropping out at about 175'.
Now, I'm getting 250', even with a slight head/cross wind @ 2-3 mph. Only using somewhere around 50% hop.
Chronoe'd at 370 fps with .36s; 470 with .20s.
Zero drop until around 240-250'.
However, I could over hop the BB at 250' by turning up my factory KWA rotary hop up (which isn't an impressive hop up. I couldn't hop hardly any weight with it) and probably get 300'.
Easy to install.
Had to do a tiny trim at the barrel retention clip.

"its perfect for use with barrel laylax and rhop

"Great bucking takes a lot of the work out of making your own. I installed it on my type 96 sniper with a Prometheus nub and the consistency is remarkable.

"Great bucking. I have it installed in my custom A&K stubby killer with a lonex hopup unit, AST concave nub, and madbull 6.03 363mm tightbore. Consistently shooting 340 FPS with .30 and groupings are phenomenal at 150+ Feet. Would highly recommend this bucking for its air seal and accuracy.

"Excellent bucking for flat hop and rhop

"Amazing bucking!!! I installed this into completely stock classic army 2014 edition m4 along with madbull 6.03 black python barrel and mapleleaf concave nub and was able to hit people 95% at 150 feet with eliteforce .25 bbs. iv put just over 10k rounds through it and no tear yet.
just beware the bucking lips were a little tight around the bb which could cause feeding problems.

just make sure you use a flat nub or equivalent to achieve maximum performance.

"I have used one of these buckings between a Krytac and a G&G, it works fantastically.

Grouping for both guns is excellent, with both reaching over 200 feet with the proper corresponding parts and mods. I don't see the problems people are having with this bucking, I work in a Hobby Shop and we love putting these in. I have had the same bucking for a YEAR with excellent results.

Pros
-It works as advertised
-excellent grouping
-Works great when making a flat hop
-don't have to modify when flat hopping, already flat

Cons
-If used without other quality parts, it will become a lemon

"Got this bucking expecting a horrible product based on other reviews. however, i found this to be a great product and it works perfectly for me. my only issue was that the lips on the back were too long, and so was the bucking. to fit this into my KWA km4, i cut about 1 mm off the bucking with scissors and used a dremel to shorten the lips. now it works perfectly.

"Good seal and performance no doubt, but too long for a retro arms hop up unit and needed a 1/8in trim to work. Otherwise perfect. If you aren't comfortable spending 15.00 on a prommy purple and shaving it, get this.

"Hello Everyone,
I am writing this review to provide compatibility information. Based on my recent experience, this particular Prometheus flat-hop smooth bucking is NOT compatible with:

1. Krytac Barrett REC7 DI with the stock Krytac rotary hop-up unit installed on a Prometheus EG Krytac Special Edition 280 mm long 6.03 mm tight-bore inner barrel. I noticed the bucking felt “different” in my fingers and then, sure enough, when I installed the bucking the gun immediately experienced a drop of 30 fps. I then switched back to the stock Krytac bucking and the fps immediately returned to normal.

It is also NOT compatible with:

2. Krytac Barrett REC7 DI with a MAXX ME-PRO hop-up unit installed on a Prometheus EG Krytac Special Edition 280 mm long 6.03 mm tight-bore inner barrel. The bucking weirdly "bunched up" at the nozzle end of the hop-up unit which prevented the BBs from loading properly and thus the gun would not fire. I did reposition the bucking on the barrel several times with no success. I then switched back to the stock configuration and the gun once again fired normally.

I took a closer look at this bucking and noticed that the nozzle end is “bulkier” and it does not have the same chamfer angle that the stock Krytac bucking has. Similar to Kristopher’s review of this bucking, I also noticed that the rubber at the nozzle end of the bucking is ragged/rough which could lead to a poor air seal thus contributing to the fps drop. In a last-ditch effort, I attempted to smooth the nozzle end of the bucking with 600-grit sandpaper with no success.

FYI, the configuration that did end up working for me is the Krytac TRIDENT MK II CRB-M with a Modify flat-hop hard-type bucking installed on a Prometheus 300 mm long 6.03 mm tight-bore inner barrel with R-Hop installed combined with a MAXX ME-PRO hop-up unit. I hope this review helps!

"horrible quality. the part i received had a seam running down the middle from a sloppy mold. plus the lip was too long so it wouldn't feed any magazines on my m4. plus the rubber had a grainy texture and split down the seam when i tried to flip it inside out like every other flat hop bucking. ripped in two, wouldn't feed, horrible texture and bad mold

"Do not buy, lips are very poorly molded and look chewed up. Will not seal against nozzle so BBs just roll out of barrel. Stock modded bucking is better than this.

"Read the reviews and saw the 5 stars, upgraded my Five HPA Polarstar Fusion Engine guns and every one of them shot like I has a bent barrel, up down left right straight the again up down all over the place, I tested the guns on the field and I was pretty upset, one of the refs there overheard me and said ge had the same exact results from these buckings, I'll be asking for a refund and returning these they put on Prometheus 6.03 barrels and they all top of the line parts, these should be removed from the site, the soft purple buckings or modify flat hop buckings are going back on.