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Lessons learned from upgrading a Tac 41

6521 Views 50 Replies 9 Participants Last post by  TannerGil
Hey Folks,

So I got a Silverback Tac 41 a few months ago and was impressed with the out of box performance (except the spring power but I expected that). After doing some research, I determined that the best options for upgrades were either to buy the Silverback upgrade parts or purchase the Stalker upgrade parts.

I decided to go with the SB parts after some persuasion. The Stalker parts are quite expensive and the Tac was shooting consistently around 250 Ft (75M) with a M150 and AEG hop unit.

I purchased:

Silverback Advanced Piston Head
Silverback GBB Hop Unit
Silverback GBB Cylinder Head
Angel Customs 6.01mm 420mm barrel
Silverback Triangular Outer Barrel 420mm
Silverback Carbon Fiber Suppressor Short
Silverback Advanced Hop up Wheel
Novritsch Spring Shims
Novritsch 3-9 scope

The angel customs barrel was lapped/polished and R-hoped by our good friend SiliconeSword. The original plan was for him to install one of his SS-Nubs into the Hop unit with a lapped barrel and R-hop patch.

After the work had been done he sent the barrel/chamber back, and boy was the lapping and work he did super impressive. Unfortunately there was no hop being applied to the bb...UH OH.

Lesson One: The SB Hop chamber really only works with open barrels without a bridge. This is something I likely should have figured out quicker since the barrels that SB sells for the GBB chamber are bridgeless. After figuring that out I had to take apart the work he did and remove the R-Hop patch. Then I began the process of removing the bridge with a file.
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Luckily I had an extra Maple Leaf Autobot 60 degree sitting around. I put it on and tried to carefully install into the unit.

Lesson Two: You must be very careful installing the bucking into the GBB unit. The GBB unit goes together very differently than the AEG Chamber and has a metal sleeve that goes over the bucking. If you do not lube it well with something that will not impact function, it could rip the bucking.

Also DO NOT try to insert the bucking into the sleeve as in the picture below. You should slide the sleeve in from the muzzle and let it slide up the barrel and over the bucking. I tried to force it the other way and ripped my bucking.... 馃挬

I ended up having to order a Maple Leaf Autobot Silicone 70 degree and also ordered the Silverback Advanced Hop wheel because the plastic nub that comes with the SB hop units is a little lack luster.

After receiving the wheel/nub and the bucking I installed everything without ripping the bucking (Yay!). Unfortunately I was still not getting hop applied... I was very frustrated.

Lesson Three: Just because its made by Silverback, doesn't mean its going to be as good quality as it is expected to be. After a lot of trial and error I finally determined that the ramp under all the wheels was not contacting the Nub. It was as if the GBB unit was too tall with where the wheel attached, or the nubs were too short for the unit.
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After figuring out the issue, I came up with the idea to add material to the top of the nub. I actually used the laminated paper backing in the packaging for a bucking. I added two layers using super glue and finally had success with what I expected for this hop up.

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Here is a video of the results : Silverback Tac 41 shooting 200 and 275 feet

In summary, I am very pleased with where my rifle performance currently is but am kinda bummed by some of the quality control of the Silverback parts. At this point, I kind of wish I had just gone with Stalker parts off the bat and had my barrel lapped as well. I will be opening a support ticket with Silverback about the nub but am glad to have a solution for it in the meantime.

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Anyway thanks for reading my long winded post. Let me know if you have any questions on it.
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I can see that but the problem I had with the WASP was that I had to really twist and pull to get the spring both on and off the spring guide. To get the stock spring off the wasp I evem had to put a flat head screwdriver at the base between the spring to help pry it up. It just seemed excessively stuck on. I don't know if that impacted the springs functioning while it was installed though...
Yeah that does sound tight. I don't know much about that piston/guide but I see a lot of people using rapax springs with it.
Yeah that does sound tight. I don't know much about that piston/guide but I see a lot of people using rapax springs with it.
Yeah thats what I got but same thing with those ones.
Yeah thats what I got but same thing with those ones.
Yeah thats strange. I would ask in one of the facebook groups or on this forum.

I dont have much experience with that piston.
Yeah thats strange. I would ask in one of the facebook groups or on this forum.

I dont have much experience with that piston.
I did buy it second hand so I'm wondering if the original owner had the wrong spring guide Included...
Related towards upgrade the TAC 41P, the spring guide, is the spring supposed to be loose around it or pretty snug. For example, the WASP piston spring guide makes taking the spring off near impossible, or at least exceedingly difficult. But the stock spring guide is exceptionally loose. So just curious if it makes a different or not?
The spring should be somewhat loose and free to rotate so that they don't scrape along the spring guide and cause significant friction damage as well as reduce energy loss

Obviously it's no good if there are massive (~1mm) gaps, but sufficient to freely rotate is totally normal if not necessary
The spring should be somewhat loose and free to rotate so that they don't scrape along the spring guide and cause significant friction damage as well as reduce energy loss

Obviously it's no good if there are massive (~1mm) gaps, but sufficient to freely rotate is totally normal if not necessary
Awesome ok good to know! Thanks for that tid bit.
Well just an update - Tac 41 is still rocking and rolling. I am able to get 85ish meters with .48s at 2.6J consistently.

I am curious how things would have gone if I had gone the full Stalker route. It would be neat to have another Tac 41, fully stalkerize it, and compare the results.
Silly question, would tac41 work with Novi's m220 ? and or this one ?
Silly question, would tac41 work with Novi's m220 ? and or this one ?
As long as it's APS-2 spec (9mm spring guide width) you can use them no issue
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Considering the price-point would you consider the upgrade from stock to GBB for the Tac-41 worth it? Converting mine would cost hundreds of dollars and I can't really justify it without knowing how big a performance jump it would be.
Considering the price-point would you consider the upgrade from stock to GBB for the Tac-41 worth it? Converting mine would cost hundreds of dollars and I can't really justify it without knowing how big a performance jump it would be.
It is if all the parts are machined properly from Silveback. As you can see in my summary, I had some issues with my nubs from them. Outside of that, it gave me a range boost of around 16M/50ft and a much more precise shot. Doesnt sound like much, but when sniping, an extra 10-15M is a sizable increase.
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