This is because the P320 uses a tilt-barrel action - the further forward the weight of a silencer, the harder it is to run. Chances are, if you can find a suppressor with an appropriately meager diameter, it still won’t run very well. The first thing you need to do is configure this barrel/slide combo in a regular P320 setup. Finding a silencer that worked? Well, that was a larger problem. We obtained a full-size P320 threaded barrel from SilencerCo SIG not only threads their barrels in weirdo metric, they simply do not currently make a threaded barrel for their full-size pistols. The suppressor/booster diameter matters for two real reasons, namely the limitations of the opening of the chassis itself and interference with the charging handle (the latter being the reason why you need to use a full-size barrel and a compact slide).Īnd then, you’ll still have some problems. The 1,000-lumen SureFire XH35 found a home, working well within the performance envelope we desired. While the new 1,000 lumen SureFire X300U certainly fits the bill, we found the bayonet-type mount to be less secure than the thumbscrew B-models. Though real estate is certainly at a premium, we knew we’d need a white light. Given the closet-quarters nature of a short-barrel pistol-caliber carbine, we felt A-OK popping an EOTech right on top, though any red dot will find a happy home on the FCU X01. We’ve gone so far as to include this as part of our assembly process, since it was a problem that regularly plagued us. If your trigger isn’t resetting on your X01, this is probably the culprit. In order to fix this, pop up your top cover, lock your slide to the rear, and push forward on the trigger bar tab. You may run into another quirk of conversion - a dead trigger. Either way, if you purchase an FCU, do yourself a favor and just buy a second complete mag release for dedicated carbine use. Why everyone doesn’t just go the route of the 1911 and only require a screwdriver is beyond us. Removal of the P320 magazine release requires the use of a paper clip or other small item to depress a plastic tab for disassembly and removal. ![]() But a replacement was sent out the same day).Īdjustable recoil spring assemblies make shooting the X01 suppressed better - at least after some tinkering. The front takedown pin features a neat captive pin (we broke one, of course. The X01 is a two-piece design consisting of the lower frame and stock, and the upper receiver with a continuous Picatinny rail and push-button rear latch. Any stock that can attach to a Picatinny rail will work, and though we’re not saying we modified a Micro Uzi stock to fit one, we were able to modify a Micro Uzi stock to fit the FCU.Īdmittedly, the complete X01 looks a skosh like a Beretta Storm and a SIG MCX had a weird baby. The X01 is designed to accept a SIG MCX collapsible stock or brace, though you can order one without. With that said, you do currently need a P320 slide, chassis, and barrel (at least for now - more on this later). ![]() Compact slide with a full size barrel certainly looks funky in pistol form Designįunctionally, what separates the FCU X01 from other pistol-to-carbine conversions is that a complete pistol isn’t needed to insert inside a frame à la the CAA Roni, Hera Arms Triarii, or FAB Defense KPOS.
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