[simo1000rr]

Ok so I need some help. Hopefully you guys with your knowledge will either know what to do or be able to point me in the right direction.
So i just bought this RA tech aluminum nozzle and i installed on the stock Bolt carrier so every thing fitted perfect when i installed it , and the Aluminum nozzle moves flawlessly inside the BC also the steel guides supplied with the nozzle they fit in place perfectly,
So i put the bolt carrier inside the gun ( WE M4 CQB-R) and i pull the charging handle a couple times to make sure it moves good and it moves great and very smooth BUT i noticed some slight difference from when the plastic nozzle was installed ,

The difference is when i would cock the gun with the plastic nozzle installed the plastic nozzle tend to stick inside the Hop up unit for a few seconds till it retract back inside the Bolt carrier ( i don't know if any one noticed that ) but with the aluminium nozzle the head is very smooth that it never stick inside the hop up unit, Maybe one or two times it would stick but most of the time its very smooth that it never stick.
So i thought may be the plastic nozzle is bad and the correct behavior should be the Aluminum nozzle not sticking , So i go on and i put a magazine with no BB just to see if it would cycle smoothly and it cycles smoothly with out any problems.
well up to this part everything seems very good and in place just like the stock parts so i go on and i load the magazine to try it,

So i shot the first shot on semi it goes very well the second shot goes very well and the third but then all other shots after that just drops off of the barrel a few foot just like u spitting it and some time it spits 2 BBs at a time, So i thought maybe its out of Gas so i refill it and shoot it but No the same thing it spits out the BBs instead of shooting.
At that point im scratching my head and i dont know what can possibly be wrong every thing fits perfect better than the plastic nozzle so whats the deal,
So i install back the plastic nozzle and i checked if the tip of the plastic nozzle stick for those few seconds inside the Hop up unit while charging the handle and YES it does so i load my magazine and i shoot on semi and to my surprise the guns shoots all the BBs in the magazine without a single misfire or double feed , i load another one same thing works perfect, So i install back the aluminum Nozzle and i check to see if it sticks like the plastic one inside the Hop up unit and some time it does and most it doesn't So i load the magazine and i try to shoot and the same results again happened but this time it tended to shoots 6 shots perfectly before it starting spitting the BBs.

So im sorry if my thread is long but im trying to give you a clear picture of what is happening because i searched the forum for a similar issue but with no luck , So at this point i don't know if the Aluminium nozzle should be a little bit rough that it would stick for a few seconds inside the hop up unit before retracting or that has nothing to do with the mechanism of shooting BBs in this guns .
Please guys any help would be appreciated and any thought even if you think that its irrelevant please share it may be it would help me . Thank you in advance for any help you would share.

Oh i forgot to mention , every thing is lubed very well , the Gun is only few months old and never had any problem what so ever with stock parts regarding shooting or misfire or any thing of that sort , I also followed that steps on the RA Tech website regarding fixing the performance of the Aluminum Nozzle by adding sealing tape in the lower seat of the Aluminum Nozzle.