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Old 10-02-2019, 10:51 AM   #1
Stodgy   Stodgy is online now
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Location: Ash vale, Surrey, England
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Hello all.

I am after some advice. I recently picked up a mildly upgraded SRS 16 covert with a fast hop, tnt tr rubber, panthera nub and fast hop that I think is fairly old because the rifle is a gen1 converted to pull bolt.

However, I am really struggling with airseal in the hop. I have narrowed it to the bucking barrel interface as even though I have Teflon taped it when I put my finger over the end and seal the rubber and blow down it air escapes. Now I suspect an area that is causing this leak is the hop alignment channel being longer than the bucking and that’s where air is escaping.

Does anyone have any thoughts how to improve it? At present the usual airseal test takes about .5-.75 of a second for the piston to hit the end of travel. Before you ask I get perfect seal in the piston and cylinder.

I’m wondering if a new hop rubber may help as I installed a new tr rubber that came with it (I think it’s fairly old as the inside of the lid it came in was silver and not gold like the one I can see in skirmshop).

Apart from this I’m really impressed. Range isn’t quite there compared to my vsr but I can hit a head sized target at 67m (lazed not airsoft) with a flat trajectory.

Performance is 2.3j for U.K. limits with a .45 Geoff’s bb.

Many thanks in advance in my hunt for perfection.
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Old 10-02-2019, 12:07 PM   #2
Fluppi   Fluppi is offline
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I've seen alot of people having air seal problems with both TNT bucking and fast hop. Try a stock Silverback bucking (60). The contact patch is similar to the TNT one. I have 100% airseal without any teflon tape in my fast hop.
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Old 10-02-2019, 01:21 PM   #3
Stodgy   Stodgy is online now
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Thankyou I will get one ordered and give that a go. Fingers crossed it works.
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Old 10-02-2019, 07:47 PM   #4
Myzur   Myzur is offline
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I had heard about the air seal problems a lot before getting my SRS and the air seal with the tnt bucking is what everyone had problems with. As I could not find a TNT bucking for sale that would ship to me I opted for the Silverback 60* bucking and it was perfect seal without the need for taping down the bucking. However I kept the stock barrel so I do not know how the bucking would do when paired with the TNT barrel.
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Old 10-03-2019, 03:26 AM   #5
Stodgy   Stodgy is online now
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I have ordered a new set of TNT buckings as I suspect age may not be helping. I have also got a maple leaf on route along with a silverback OEM so I will try them all and see what works best when I get the chance. Will report back how I fare to assist others in the future.
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Old 10-09-2019, 12:51 PM   #6
Stodgy   Stodgy is online now
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So as a way of an update.

The maple leaf bucking was a dud a I brought one that’s specifically for vsr cut barrels not realising that the SRS specific bucking was for that. Oops.

However, I did find the source of the main air leak on TNT TR buckings when paired with a TNT barrel. It was through the alignment channel and a mix of insulation tape and PTFE tape extended past the end solved the vast majority of the leak. The final small leak is the feed lips and nozzle but I did notice the sound went up on firing from when I had more leak. My simple mind deduces this is because the cylinder is now more over volumed for the barrel even with the WASP at full weight with the full brake installed.

Alas it got dark before I had a chance to chrono so I can’t comment of the fps change or if the consistency is improved.

I have a hard prowler nub on the way to replace the 75 degree prowler nub which I suspect will improve consistency as only one element will be deformable (as in the hop rubber) which will help with consistency as the bb passes the hop on firing as well. I also suspect a few light strokes to remove the full curve will also help. Annoyingly after I ordered it I realised that stalker have a new panthera nub designed specifically for TNT TR esq nubs.

I also applied the ‘blow test’ to the stock bucking and had a good but not perfect seal but of note I did not PTFE tape it. I am not going to proceed with this as the various sources seem to suggest with work other buckings can perform better. But until I get a chance to play and compare it against my VSR I will keep an open mind on the current setup. If it matches I will stick with it. If performance is reduced then I will try the silverback bucking so the helpful comment above was much appreciated as it gives me options to try and test.
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Old 10-18-2019, 05:47 PM   #7
Myzur   Myzur is offline
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Good to hear you found the flaws. The air seal on the fast hop and the silverback 60* bucking on mine held up really well, even in the terrible dust that is always around where I live. Just keep track of your data to make sure it stays consistent. Let me know how the new bucking works for airseal. I am going to tinker with some other buckings at some point too.
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