Madbull barrel's have that coating on them that doesn't help with this process of sealing. Something I suggest with most AEG buckings and barrels is very tightly wrapping the last 1/8th in of bucking(towards exit of barrel) onto the barrel its self with teflon tape. Be careful not to wriggle or cock the bucking from its original position. This will ensure a proper seal.
Not that I dont question Teflon (better known by PTFE) tape's merit in working in our application, it's definetly not sealing the way it should. Ideal sealing is created when a material is impermiable (meaning nothing can pass through it). PTFE tape is not impermiable. PTFE's primary function in plumbing is to take up space between the threading on pipes, not create an impermiable barrier between two surfaces. Because we dont have threading, all adding PTFE tape to a hop up rubber is going to do is going to apply pressure to the hop up rubber and force it either to seal with the hop up unit or to the barrel. Thats ultimately our desired attempt, but for that purpose, ANY tape could suffice. PTFE, or any tape does not guarentee a proper seal though.
There are two methods that do work with 100% sucess every time. If you are having trouble with getting hop up rubbers to seal against barrels then try one of these two methods:
1.) Silicon sealent. Silicon sealent is designed to operate as an impermiable barrier. How it's applied is by taking a little bit of sealent and putting it around the back end of the hop up rubber and a little between the hop up rubber and the barrel. Let sit and cure for the time on the bottle. Once it's done, reassemble the hop up unit and have at it. This is an ideal sollution and should be the proper method to use if you are having trouble getting a hop up rubber to seal.
2.) Thread wrapping (whipping). Similiar to how you would whip the end of a rope, the same can be done by tieing a knots around the back end of a hop up rubber using small but durable thread. The goal here is to produce similiar results to PTFE tape but while guarenteeing that the hop up rubber will seal. By tieing a series of overhand knots around the back end of the hop up rubber you force the hop up rubber into sealing contact with the barrel. This method is particularly effective when silicon sealent is not easily available (IE at the field).
Because PTFE tape is just a space filler, it does not guarentee sealing, especially considering there can be an uneven amount of wraps on one side of the hop up rubber.
Anyway, what am I doing wrong, that so many people are having trouble with Madbull barrels and I am not? I've not once had an issue getting ANY hop up unit to seal against a hop up rubber using either a Systema or my prefered Guarder buckings? Maybe thats what I'm doing wrong, I'm using buckings that are known to be slightly larger and as advertised: provide a better seal
Curiousity has the better of me, what buckings are you using that you are having issues getting buckings to seal?
Breaking in madbull barrels? Ok... I dont believe that, mine have been very accurate since the 1st BB, but sure
I'd like to see how a plastic BB which is inherently softer than both the material of the barrel and the coatings of barrels, can affect accuracy... maybe there is more here than what is being told? The only time I've had issues with a fresh TBB is when installed with a fresh hop up rubber, and that is the hop up rubber being worn in, not the barrel?
<shrugs> I wish to be enlightened...
