TECHNICAL
MASTERE MODS both are fitted they give an amazing air seal when fitted in the hop chamber , so good in fact , that I had to detune the Specna to bring it back down to legal limits - and the same with the G & G ! Just the barrel alone gave me an increase of nearly 40fps and a substantial increase on range over the stock Specna barrel and rubber .
I fitted the rest of the parts to the G & G , with some minor alterations to the cylinder head , which took all of 10 seconds just to make the holes fit over the locating pins inside the gearbox casing . Once they were all fitted I was eager to get testing and I was a little disappointed at first , as I had a drop in power output . Puzzled … Hmmm … What could be the problem ? So , I started the process of elimination and it fast became apparent as to what the problem was : the aluminium nozzle wasn ’ t sealing inside the hop rubber feed lips . So , I had to dismantle the gun once more and remove the Master Mods nozzle , replacing it with the stock G & G nozzle , only to find when chrono ’ d again that the power was now at 380fps . So the nozzle was the issue 100 %.
380fps though , on a gun that was only pushing around 295fps to start with ! I ’ m very impressed with the parts as I was using the original spring , which obviously meant the stock G & G parts weren ’ t giving a good air seal . The Master Mods nozzle is very flat and square edged on the end , with no taper for it to seal on the rubber ( which was strange ) and I can ’ t see why they would do this . Was it a manufacturer defect or an actual design flaw ? We shall endeavour to find out .
FITTED TO PERFECTION
Let ’ s have a look at exactly the parts fitted in the G & G .
300mm stainless 6.04mm barrel which has been precisely machined and finished to an exceptional standard , with not a single flaw to be found . I personally prefer a 6.03 or a 6.02 but I have no complaints over accuracy or range achieved with the Master Mods parts - I was losing sight of the BB they were travelling that far !
The combination of their barrel and new R-Hop setup is a game-changer and the 14-tooth metal racked reinforced piston is of superior quality and it is honestly so solid . I haven ’ t ever seen a piston as beefy or as strong as the Master Mods piston , so I can ’ t see this breaking any time soon . The metal teeth of the piston mesh really cleanly with the G & G sector gear , so they should wear relatively well , prolonging the life . The spring was a nice snug fit also , which I believe is the reason why it no longer twangs after each shot . The runners are very smooth , making piston travel much more efficient ( I ’ ve definitely found my new replacement pistons !). The 6061 aluminium 8 vent piston head is a nice chunky piece of kit , which comes with a thrust washer and the anodising is near perfect . It ’ s been etched with the Master Mods logo , not that it ’ s on show but it is a nice little touch of class . It sealed well in the stock cylinder , giving me most of the power uplift due to its superior seal .
The 6061 aluminium cylinder head is again of high quality and has a nice little feature to the front . It has a rubber insert which , when fitted , cushions the head against the inside of the gearbox . Sadly , I had to remove this in order for it to fit the G & G gearbox but that said , it didn ’ t take away any of its performance . Two O-rings give a really good seal ; it was a little tight to fit but nothing a little silicone oil couldn ’ t fix . The two holes which hold the cylinder head in place had to be very slightly modified in order for it to fit over the pins but I ’ m not talking anything drastic , no more than 1mm of material removal to get it sitting over the pins ( and it ’ s not the first time I ’ ve had to do this to a cylinder head !).
Sadly , the 6061 aluminium M4 / M16 cross air nozzle was a bit of a let-down for me if I ’ m honest . The nozzle itself is a lovely piece of kit with its O-rings and its cross cut on the end for air direction , with a great finish on the anodising but it ’ s just I feel the flat nontapered end has made this part the lesser for me .
We ’ ve now spoken to the Master Mods techs about this , and they told us : “ We consider it ’ s important when players are getting this nozzle from Master Mods , that they need to check if their stock gun fits 21mm , which is on the nozzle marking , because there is always dimensional tolerance between each brand and the boxes .
Though it says it ’ s for “ M4 ” ( which we will amend to be clearer ), still , there are dimensional gaps and the user may have to do some adjustment . Therefore , maybe we will develop more nozzles of different
“ THE 6061 ALUMINIUM CYLINDER HEAD IS AGAIN OF HIGH QUALITY AND HAS A NICE LITTLE FEATURE TO THE FRONT . IT HAS A RUBBER INSERT WHICH , WHEN FITTED , CUSHIONS THE HEAD AGAINST THE INSIDE OF THE GEARBOX . ” www . airsoftaction . net 61