TechT Products are absolutely kack, most of them will do nothing the rest will more than likely break something, save the pennies and put it towards a decent marker. you will never recoup the money, nor will it make any notable improvement.
ever heard the saying "you cant polish a turd" wish id listened to that when i spent a fortune on every upgrade going for a A5, just not worth it when you can pick up an invert mini for about £100 which will out shoot a blowback in everyway.