Haven't tried it myself, but RS buffers have a flat surface, whereas the MWS buffers protrude and mate with the BCG. I heard that they work, but that they create performance issues because of the lack of protrusion!
If they are putting it in an AR receiver block in the vice then you should be all good- if they are trying to put it straight in the vice then I’d be very worried.
The Warrior ones are a clone of the HSGI Tacos but, in my opinion, not as good as the Tacos.
It sounds to me like you aren’t weaving the pouches on properly if they are coming off the plate carrier- can you post a close up of how they are attached? With any pouch I’ve ever used, the chances of them coming away from the plate carrier is zero...
The way I remember it, and bare with me here........ is this:
If you were to hold the rifle as if in the aim and rotate the rifle around the wheel, and keep the wheel still... the rifle will point upwards and the wheel won't have moved relative to you. That way makes the BB's go up i.e. more hop.
It acts as the rocket valve and by adjusting it you change its length. In its “shortest” setting, it absolutely increased FPS for me and it’s adjusted by an Allen key type tool (though its not actually an Allen key) so in theory you have a high level of granularity in your adjustment.
So cost including shipping is 4198HKD which is approx £435. You’ll pay 2.5% duty on the cost of the item and shipping which would be £10.88. You’d then pay VAT on the cost of the item, The shipping and the duty which would be £89.18. Therefore your total cost would be £535.06. If you were lucky for customs not to charge it then you’d be better off, if they do then you’d be worse off.
See I found that I got inconsistent fills when I used o-rings in the mags... I could get larger fills, and didn't waste gas... but inconsistent none the less. I found that the temperature of the mag played a great part in this and if the mag was warm, I'd struggle to get much in and if it was cold, it could fill it up a lot.