The TM AUG is something I've not had a lot of dealings with. A good portion of AUG users tend to have the cheaper models and tweak them a bit.
JG and APS AUGs I do know.
The style of the gun you are looking at is the AUG commando. It is available from all 3 of the main aug manufacturers. JG, APS, TM. Each one has slight differences but are functionally identical.
JG sell the basic commando for £120, re-branded as snow wolf.
https://gunfire.pl/product-eng-1152215959-SW-020T-Carbine-Replica-Tan.html
It is not a high cycle gearbox, and will do 15-18rps on a regular 7.4 lipo.
APS also make a commando variant for £140, Re-branded by Gunfire in this instance.
https://gunfire.pl/product-eng-1152216089-GFG54-carbine-replica-tan.html
It is also not a high cycle gearbox, and will do 12-16rps on a regular 7.4 lipo.
Externally both are very close to the TM. APS models have a raised texture on the pistol grip and body but other than that they all look the same.
The high cycle in contrast will be doing 25+rps on a 7.4 lipo.
ASG AUGs can be either APS or JG depending on the model of gun. They cherry pick contracts.
You have several options in my mind.
You go with the high cycle, Consider adding a mosfet, Grab 5+ mags. Cost £345-355 ish (not including the labour for the fet installation, batteries or charger).
Or you go with the JG. Add a fet (£10), a quality high speed motor (asg ultimate 35K) (£50),Steel bushings (£10), SHS silent head system (£25)(optional), A tight bore barrel like a ZCI(£20)(optional), Grab 5 mags (£45). £235-280 (not including labour,batteries charger). You still get 25ish rps, But also a box built for 350fps that should be durable as well.
Either way would work from my perspective, I'd probably err on the side of the JG just because you have some cherry picked components, and a TBB as well as a few spare parts for messing about with.
APS guns are also upgradable in the same way the JG is, However with the aps gun the piston head upgrade is essential as the stock APS ones are garbage.
Why would you want to? If you want a longer aug variant they already exist. The A1 A2 and A3 models all have 509mm internal barrels. The Commando variant has 320mm just under what is normal on an M4.
If you are adamant on the TM then adding inner barrel length may also cause other problems. Those guns use ported cylinders. Adding barrel length means that the cylinder no longer has the volume of air to get the BB out of the barrel effectively. In short you loose FPS and accuracy. You can still add a suppressor by using the adapter that comes with the TM, The JG doesn't come with an adapter so you would have to buy an aftermarket one.
