Quatromax® – Blaser special model to suit diameter 17mm factory threaded barrel (M15x1.0mm). Also now available is a special model for the Blaser ‘semi-weight’ barrel (20mm diameter) threaded M15x1.0mm. (M17x1.0mm thread option – now available) Note that Blaser ‘Semi-weight’ barrels can now be either 19mm or 20mm diameter – please specify exactly which one you have when ordering.
Available in M15x1.0mm standard thread or M15x1.0mm ‘tight-spec’ thread (to suit factory-threaded Blaser barrels).
(NOTE: ‘Tight spec’ thread version is only intended for barrels with the factory muzzle thread done by Blaser factory, as they seem to undercut their muzzle thread by 0.006″ to 0.007″. To compensate for this our ‘tight spec’ thread is 0.005″ undersize on crest cut diameter, so the fit of the brake will be fairly close and not too sloppy on the thread fit. If your barrel has been threaded by a gunsmith then please specify the ‘standard’ M15x1.0mm thread.)
Supplied pre-tapered and bored for calibre clearance; please specify calibre when ordering. Black coating of these stainless steel muzzle brakes is available if required for a small additional cost. (See price list for details.)
Also available is Quatromax M18x1.0mm thread to suit Blaser ∅22mm barrel, and also a M17x1.0mm thread for Blaser ∅19mm or ∅20mm barrel (please specify when ordering by email). Note that the ’22mm’ brake is actually 22.2mm diameter, and is also able to be fitted to Sako or Tikka 22mm diameter barrels with M18x1.0mm thread.
For the UK market we are also now producing a special adaptor sleeve and Quatromax brake combination (ordered together) for use on the Blaser factory threaded ‘spigot’ type barrel. Note that these barrels use the ‘standard’ spec M15x1.0mm threaded muzzle brake, NOT the ‘tight spec’ option. Black coating option available. Please email us for more details.
Quatromax® – AR15/AR10 special model.
(This pre-tapered model is also suitable for the Ruger Predator and Precision Rifle, and any others with 0.750″ diameter barrel and milspec ½-28 or 5/8-24 threading.)
Available in ½-28UNEF or 5/8-24UNF standard spec thread, 0.636″ long thread recess.
Can be supplied either untapered at rear, or pre-tapered and bored for calibre clearance; please specify calibre when ordering.
Black coating of these stainless steel muzzle brakes is available if required for a small additional cost. (See price list for details.)
This system has been primarily designed for factory threaded barrels which have a thread extension length between 16-17mm, or milspec-threaded nominal 5/8″ thread lengths. Current thread sizes and (Internal diameter) barrel clearance sizes available as follows:
½-28: ∅0.760″ (Std AR15), ∅0.893″ (ideal for JP ∅7/8″ AR barrels)
5/8-24: ∅0.760″ (Std AR15 or AR10), ∅0.806″ (for Tikka T3 CTR), ∅0.860″ (for Remington & Savage heavy barrels), ∅0.935″ (for DPMS & similar heavy ∅0.920″ barrels)
M14x1.0mm: ∅ 0.688″
M15x1.0mm: ∅ 0.688″
M18x1.0mm: ∅ 0.888″
*Note: The thread ideally should be of a length from 16-17mm long, with NO generous thread relief undercut just before the thread shoulder. (i.e. as found on some Sako or Blaser barrels). Most US-Milspec threaded ½-28 and 5/8-24 barrels that feature a thread cut that runs up very close to the shoulder are ideally suited to this brake/lock nut system. For barrels that do have the deep thread relief a rubber O-ring can be installed to prevent the Rapidex™ nut running partially or fully off the threaded section – which could possibly cause thread damage if the Rapidex™ nut was over-tightened with only partial thread engagement.
Another unique feature of this system is that it does not actually require a thread shoulder on the barrel at all – this is because the brake is secured tightly due to tension/friction between the brake body and the special Rapidex™ locking nut. What this means is that accuracy-minded gunsmiths can fit this system to custom barrels and use the largest thread size possible for a given barrel diameter/size at the muzzle in order to avoid the chances of bore enlargement due to excessive metal removal and resultant stress release which can occur in some barrel types. Example: If you have a barrel with a muzzle diameter of ∅0.710″ you could effectively use an M18x1.0mm thread (∅0.708″) cut about 16-17mm long with no shoulder at all and install the Megamax Quicktime™ system.
Another advantage of the Quicktime™ system is that the brake can be quickly removed and swapped between different rifles which have same thread and similar barrel diameters. Additional wrenches or Rapidex™ locking nuts may be purchased separately if required.
The kit features a Megamax® muzzle brake of the requested thread size and pre-bored to specific calibre clearance, a special Rapidex™ tapered locking-nut of a specific barrel clearance diameter, and a specially-designed wrench to fit the Rapidex™ locking-nut. A small length of plastic rod is also supplied which is inserted through the brake ports when tightening the nut/brake onto the rifle at the correct index/alignment point.
See our video below to check out just how fast and easy this system really is. Can be supplied in either stainless polished finish, beadblasted finish, or black-coated bake-on paint finish (GunKote – Flat Black or Satin black. Note that there may be an additional charge for coating of some models or custom-orders.) Registered Design (Design Patent): NZ421243 . International Patents Pending.
This system has been primarily designed for factory threaded barrels which have a thread extension length between 15-17mm, or milspec-threaded nominal 5/8″ thread lengths. Current thread sizes and (internal diameter) barrel clearance sizes available as follows:
½-28: ∅0.752″ (Std AR15)
5/8-24: ∅0.752″ (Std AR15 or AR10), ∅0.792″ (for Tikka T3 CTR)
(Tapered sleeves to suit the Blaser M15x1.0mm and other sport-weight barrels are on custom order only at this stage.)
For this system it doesn’t matter if there is a thread relief under-cut before the shoulder or not, as there is no female thread in the sleeve itself on this model – the sleeve just fits loosely over the barrel and must be approximately aligned with the brake body before snugging it up tight.
Shim washer kits (featuring multi-thickness ∅0.750″ outer-diameter shims) for either ∅½” or ∅5/8″ threads can be supplied by us, or you can purchase them directly from Brownells (USA), or elsewhere. Using a shim-washer (or multiple washers) of varying thickness the customer can set the brake to pull up tight with a plastic dowel rod to stop just short of the correct radial indexing point.
The brake is supplied as bored for a specific calibre clearance, and can be coated black as an optional extra if required. Please specify your exact barrel diameter and calibre when ordering, and whether or not you wish to purchase a shim kit from us as well. Making your own special shim washer on a lathe is also another option, and this fits up inside the tapered sleeve so it is hidden from view.
This is similar in some ways to the Megamax Sako/Tikka special model, which also has a hidden recess for housing an indexing shim washer.