Yes. There is a dial on the gas block that is accessible through the oval ports on each side of the upper receiver.
WARNING!!! MAKE ABSOLUTLEY CERTAIN THE MAGAZINE HAS BEEN REMOVED AND THE CHAMBER IS EMPTY BEFORE ADJUSTING THE GAS DIAL.
When the firearm is cold, you can use two fingernails one on each side of the gad dial. If hot, use the tip of two rounds one on each side of the dial.
If the gas dial is too hard to turn, remove the barrel and use an allen wrench inserted into the set screw in the gas dial to use as a lever to turn the gas dial.
Most of the cartridges the XCR-L is chambered for have different sizes and shapes. Therefore, more than just the barrel needs to be changed to convert from one caliber to another. Please refer to the chart below to see what parts are needed. We offer the parts needed in the form of Caliber Conversion Kits. Some of these kits require more parts that other. In any case, the conversion process is simple and takes less than 5 minutes.
| Conversion Caliber | ||||||||||
| Existing Caliber | 5.56 | .300 Blk | 6.8 SPC | 7.62×39 | 5.45×39 | 6.5 Gren | .224 Valk | 6mm ARC | 22 ARC | 338 ARC |
| 5.56 | A | B | C | D | D | C | C | C | C | B |
| .300 BLK | B | A | C | D | D | C | C | C | B | G |
| 6.8 | C | C | A | D | D | C | F | C | C | G |
| 7.62×39 | D | D | D | A | C | E | D | E | E | H |
| 5.45×39 | D | D | D | C | A | E | D | D | D | H |
| 6.5 Gren | C | C | C | E | E | A | D | E | E | B |
| .224 Valk | C | C | F | D | D | D | A | C | C | G |
| 6mm ARC | C | B | C | E | D | F | C | A | F | B |
| 22 ARC | C | B | C | E | D | F | C | F | A | B |
| 338 ARC | B | B | C | E | G | B | C | B | B | A |
Legend for Caliber Conversion Chart. Parts Needed to Convert
A = Nothing
B = Barrel, Operating Rod, Gas Tube
C = Barrel, Bolt, Magazine
D = Barrel, Bolt, Firing Pin, Magazine
E = Barrel, Firing Pin, Magazine
F = Barrel
G = Barrel, Bolt, Operating Rod, Gas Tube, Magazine
H = Barrel, Bolt, Operating Rod, Gas Tube, Magazine, Firing Pin
I = Barrel, Magazine
The adjustable gas system meters how much gas goes from the barrel to the piston which cycles the action. A higher number allows more gas to cycle the action. You should use the lowest setting that reliably cycles your action. Here’s how to find the right setting. After you’ve broken in the weapon by firing 40 to 60 rounds, put one round in the magazine and find the lowest setting that ejects the round and holds the bolt open. Some like to set it one setting higher just to be sure. Each brand and type of ammo is different so you may need to change the gas setting when you change ammo. As your XCR wears in, it needs less gas to cycle. You may want to check again to see which is the lowest setting that holds the bolt open.
The XCRs can be shot thousands of rounds reliably without in cleaning. However, it is good practice to clean a firearm each time it is shot if only to examine the firearm to make sure it’s all in working order for the next time it is to be used.
Whether you have an Keymod or M-LOK rail system on your XCR, you can remove your barrel without removing the accessories, but you must use screws of the proper length. Many of the screws that come with your Keymod or M-LOK accessories have screws that are longer than needed. By simply using shorter screws, you can solve the problem. If you cannot find shorter screws, send your accessories to us and we’ll shorten the screws for you.
If you live in the US, you can return a firearm to us for repair or upgrades without going through an FFL Dealer. You’ll want to make sure you package it so it won’t be damaged. Make sure to get a tracking number. You are responsible for loss during shipment so you may want to insure it. It’s best not to have anything on the package that would indicate it’s a firearm. For more information contact [email protected] Our shipping address is:
ZDF Import/Export, LLC
925 W 100 N Ste A
North Salt Lake, UT 84054
801-355-0401
We can upgrade any XCR to the current specs. If you want to see the changes that have been made to the XCR over the years, go here. We have stopped making replacement parts for some earlier versions so it’s wise to upgrade. The upgrades make the XCR smoother, more reliable, and more accurate. They also make your old XCR compatible with the newer caliber conversion kits. You can upgrade you rifle by emailing [email protected] for pricing and instructions on returning your XCR to us.
If a round is stuck in the chamber, always treat it like the round is live. KEEP THE MUZZLE POINTED IN A SAFE DIRECTION AT ALL TIMES AND FOLLOW THESE INSTRUCTIONS.
- Do not pound on the charging handle.
- Remove the magazine.
- Collapse the stock.
- Hold the firearm by the handguard with one hand while holding the charging handle with the other.
- Slam the butt of the firearm on the ground while simultaneously pulling down hard on charging handle.
- Note: it may take several tries. If you still cannot get it out, contact us.
The primary cause of the problem is that the gas is set too low causing an expanded empty case to be shoved back in the chambers. Try a higher gas setting next time.
If a live round is stuck in the chamber, this is unusual. Contact us.
Feeding issues with the XCR are extremely rare. Usually, what looks like a feeding issue is actually caused by the bolt not travelling far enough to get behind the base of the cartridge. You can tell this is the case when the tip of the round to be fed is stuck above the chamber and the bolt smashed into the side of the case usually leaving a dent in the case.
The solution is to set the gas higher so that the bolt can get behind the base of the cartridge.
Here are some things that can help improve the accuracy of the XCR
Make sure the barrel retention bolt has been tightened correctly to 240 inch pounds. You can usually achieve this by turning getting the retention bolt hand tight and then turning about 60 to 70 degrees. Buy a torque wrench in inch pounds if you are not sure.
After you have tightened the barrel retention bolt, loosen the set screw on the bottom of the gas block. If the barrel does not look centered in the upper, you can use a rubber mallet to pound the barrel right or left to center it. Then retighten the set screw hand tight and turn the wrench another 45 to 60 degrees. Use a new, unworn Allen wrench to avoid stripping out the set screw. No Loctite is needed as leaking gases will help lock it in place.
Take the wobble of the FAST2 or FAST 3 stocks. If there is any wobble in the stock’s hinge, you can fold the stock and slightly unscrew the set screw until there’s no more wobble when the stock is deployed. The sliding butt of the stock can be tightened with the thumb screw on its underside. See the Operator’s Manual for more details.
Make sure you optics are mounted correctly and to the correct torque settings of the manufacturers of your optics and mounts.
Make sure you’re using good match ammo that has the right projectile weight to match the twist of your barrel.
We have found better accuracy with a good muzzle brake than with flash hiders. A good break should have venting on both sides only, or equal vents all the way around to balance the barrel when fired.
Sometimes when rounds are loaded in the chamber, the projectiles can be marred. Polishing the bottom and sides of the barrel extension can improve this.
Check the crown of your barrel. If it looks uneven or has some burrs, recrowning my help.
If you have an older XCR-L with the Type 0 or 1 Gas block, upgrading to the Type 3 Gas block and Type 3 Gas Tube can help.
If you have an older XCR-M with the Type 2 gas system that wasn’t fit to the gas tube, having us upgrade that will help. Many of those rifles were also shipped with 7.62 NATO chambers which didn’t help accuracy.
The trigger pull can be improved by shortening the second stage and polishing the parts. This should only be done by a competent gunsmith. You become responsible for any liablity.
At the rear of an XCR lower receiver, there is usually a folding hinge, non-folding stock adapter, picatinny rail adapter or AR15 adapter with a QD sling swivel mounting hole on the bottom. The FAST3 Stock and Tail Hook Arm Brace have QD sling swivel mounting holes on both sides. The FAST2 stock has a small hole through which cord can be attached or you can mount an aftermarket QD Sling swivel attachment like this.
For forward sling mounting positions, we suggest you use something like this attached to the top rail so that your sling doesn’t interfered with the charging handle. 
You can also find QD mounting accessories for M-LOK and Keymod that attached to those rail system. Like this.
The best way to contact us is by email to [email protected] for sales questions, or to [email protected] for technical assistance.
We are trying to implement our Chat system to answer most of your questions instantly. Just click on the little speech bubble on the lower right corner of the screen to start the chat session.
We don’t answer the phone often, but if you leave a message, we will call you back as soon as we can. You can also text or fax us on 801-355-0401.
We do not take orders over the phone.
