Description
Introducing the JetBlock. A tool-less, two position adjustable gas block. We are huge fans of the AR15 platform, and we all know how badly over gassed they get when used with a high backpressure suppressor. Up until now, adjustable gas blocks had a lot of issues, including gas leak, annoying adjustments, the use of an allen wrench, screws that come loose and carbon locking. The JetBlock is our answer to those problems. Two settings… Regular and Suppressed.
Each JetBlock model includes a two-position adjustment button we call the “GasJet”, tuned for a specific barrel length, and gas system length. This product page is specifically for the custom tuned JetBlock. The two-position gas adjustment is tuned with two gas port sizes. The “unsuppressed” setting is wide open and will be the same gas tune your rifle currently has. The “suppressed” setting will be tuned by Dynamic Defense prior to shipping, based on the drop-down menu options you select.
Due to the design of the JetBlock, there is much less gas leak into the atmosphere compared to most gas blocks on the market. The gas block journal and gas tube channel are machined slightly undersized and held to a tolerance of 0.0005″. Installation may require heating of the gas block with a torch, in order for the gas tube and gas block to have the tightest fit possible. In addition to the tight fit, we machine our GasJet to have a tight clearance fit. Due to our design, the JetBlock leaks a lot less than other adjustable gas blocks, which will make your rifle run more efficiently and in theory will also make your rifle quieter with a suppressor.
The JetBlock is for use on barrels that are .750″ diameter at the gas block journal.
The JetBlock is machined from 17-4ph stainless, heat treated, wire-edm cut and treated with a durable QPQ finish. The unit is secured to the barrel by 2 allen head #10-32 set screws. The JetBlock can be pinned to your barrel by a gunsmith as an additional installation method, we will not void the warranty if you decide to have it pinned.
Each JetBlock undergoes our multi-step quality control procedure to ensure they are within our tolerances. This step is often overlooked by other manufacturers because it is time-consuming and adds to the cost of the product.
The JetBlock is designed for installation by an experienced armorer or gunsmith. The JetBlock is compatible with most free-float handguards that can accept a standard low-profile gas block.
To allow access to the JetBlock adjustment, it can be paired with a handguard which is shorter than the gas block position OR paired with a M-LOK handguard that has seven M-LOK sides, like the Geissele MK16 handguards. It will also work with Geissele MK14 handguards due to the large cutouts at the 2 o’ clock and 10 o’ clock positions. It will work with free-float quad rails with cutouts at the 2 and 10 o’ clock positions, like the Knight’s FF RAS. If you can see the top half of the gas block through your handguard slots, the JetBlock will be compatible with your setup. If you have any questions about handguard compatibility, email us at sales@dynamicdefense.org.
Race Bone (verified owner) –
I found out about Dynamic Defense from Brian from AE Suppressors who featured one on his rifle in a video. I instantly wanted to buy and install one for my Mk12 Mod H build. The Mod H has a mid-length gas system where the PRI forearm would make a standard tool-adjustable gas block not feasible to use. I also wanted the rifle to be pleasant to shoot both suppressed and unsuppressed. With the standard gas block I installed, with the 16.5 Douglas barrel, H2 Car buffer, and AEM5, the rifle was ejecting cases around 1-2 o’ clock, with some noticeable gas blow-back, and some port pop. After purchasing, I received the JetBlock and confirmed it’s compatibility with the Mod H system as the Jet is easily accessible through the top 3rd ventilation holes from the front of the PRI forearm. After installing the DD JetBlock and engaging the suppressed setting with the AEM5 mounted, not only was the rifle now ejecting at a consistent 3-4 o’ clock, but gas blow-back was reduced significantly, AND made the rifle quieter. I was amazed that I got all of these benefits plus the ability to switch back to unsuppressed with just the switch of a button.
Thomas El Prez –
I recently installed the Dynamic Defense JetBlock and have been very impressed with the performance so far. The biggest thing I noticed right away was significantly less gas blowback to the face, especially when shooting suppressed. It made the rifle much more comfortable to shoot during longer range sessions and competition stages.
The JetBlock is also very easy to use and adjust. The design is simple, straightforward, and user-friendly without dealing with complicated adjustments. Once tuned, the rifle shoots noticeably smoother and flatter, making transitions and follow-up shots during competition or stage shooting much easier and faster.
Build quality feels solid, installation was straightforward, and overall it has made the rifle run cleaner, softer, and easier to control. Definitely a worthwhile upgrade for anyone looking to improve performance for matches, training, or general range use.
Luke fox (verified owner) –
Works exactly as advertised. Easily switch my 10.3 300 blk from wide open to run subs then a press of the block restrict flow to run supers suppressed without getting gassed out. Tolerances are tight, no gas leakage. Heat+ breaking out your purse is required for individual installation. Tom walked me through the maintenence and was very open to all my questions. Cant recommend these guys enough.