This article was originally posted on Thefirearmblog.com
Sureshot Armament Group has introduced two new chassis systems for AK family of rifles. One of them is already available for preorder and the second one will hit the market later this year. The new chassis are designated as SAG AK MK2 and SAG AK MK3. Let’s take a look at each of them.
SAG AK MK2 Chassis
The MK2 chassis consists of a top piece which provides a rigid top rail platform starting from around the middle of the receiver and going forward to the gas block. The lower piece is a free floated handguard which is compatible with Bushmaster ACR handguards. It can be mounted on the ACR rifles as well as handguards from the ACR can be mounted on the SAG AK MK2 chassis. The polymer Bushmaster ACR handguards may require to remove some material from the rear portion to fit this chassis. The SAG handguard also has two QD sling swivel sockets and M-LOK accessory attachment slots.
In order to install this chassis, you must disassemble the gas block and the front sight block from the barrel (or not install them first, if it is a new build) to get access to and remove the rear sight block. Then the provided barrel nut is installed in the place of the rear sight block. After that, the aluminum top piece is attached to the barrel nut via a set of screws. The barrel nut and gas tube of this chassis are made of steel and the rest of the parts are machined out of 7075 aluminum.
This chassis also features a channel milled in the top rail for direct mounting Trijicon ACOG scopes. The top rail is also interrupted in the middle portion to allow direct mounting other brands and models of optics as well as original AK rear iron sights. According to Sureshot Armament Group, if you attach an AR-15 cantilever scope mount backward on the top rail so that it extends to the rear, you will be able to adjust a proper eye relief with virtually any scope installed.
The gas tube of this chassis has an internal diameter matching the AK piston head diameter which allows to significantly reduce the flow of gasses back to the receiver. This feature will especially be useful when suppressing the weapon because it will reduce the back pressure. And, of course, it will also make the action much cleaner.
This version of the Sureshot Armament Group chassis will be displayed during the IWA 2018 exhibition. The MSRP of the SAG AK MK2 chassis and lower handguard set is $495 or €410. The version without the lower handguard will have a price tag of $260 (€210). The Bushmaster ACR compatible handguard will also be available separately at $290 (€240). Right now the chassis is available for pre-order on the manufacturer’s website.
SAG AK MK3 Chassis
The difference of this chassis from the MK2 model is that it has a full-length top rail which is fixed to the barrel via the barrel nut and the second attachment point is on the stock adapter. This system will require to cut the original AK charging handle and replace the safety selector lever with a different one.
There will be three types of stock adapters making the chassis compatible with either AR-15 buffer tubes or Magpul Zhukov stocks or SIG MCX stocks. The front charging handle is reversible to either side of the weapon. It is a non-reciprocating charging handle. According to Sureshot Armament Group, it can be converted to a reciprocating one should the customer need so. There is a clamped block on the gas piston which provides a surface for the charging handle to push on. The handguard of this chassis is also compatible with the Bushmaster ACR one and the gas tube is identical to that of the MK2 chassis.
Below is a video showing how the field stripping of the rifle is accomplished with the MK3 chassis installed.
Sureshot Armament Group admits, that the main drawback of this full-length chassis is the need to disassemble it to get access to the trigger control group. At the same time, they claim that because the above-described gas tube makes it a much cleaner action, cleaning the trigger mechanism will be required no sooner than every 3000-5000 rounds fired.
The prototype of the Sureshot Armament Group MK3 chassis will also be displayed at the IWA 2018 show and it will be available later this year.
Both of these chassis are not drop-in products. As you can see from the description, the installation of these chassis will require some minor gunsmithing – basically ability to remove and install pins. However, the advantages should worth the hassle. At the end of the day, you will have a really rigid optics mounting platform, free floated barrel and a bunch of M-LOK slots to mount your accessories.
Which version of the SAG chassis do you like the most? What would you add to these designs? Share your thoughts in the comments section.