Common Issue Resolutions

Typical Wear

It is perfectly normal for you rifle to have wear in certain places. The most frequently asked about places are the cam pin wearing on the upper receiver, the charging handle wearing on itself and the charging handle wearing the lower receiver. All of these are perfectly normal and would not require you to send the firearm in for service.



Steel Case Ammo

Steel case ammo is not necessarily good for any gas impingement rifle.  Tula and Wolf (the two foremost manufacturers of steel case ammo) are produced in countries with rifle industries predominantly made up of gas piston systems such as the AK-47.  These don’t cycle the gas all the way back through the rifle thereby keeping the dirty gas that is associated with steel case ammo out of the chamber.  The dirty powder will eventually erode the gas rings causing the bolt to lose the seal and permanently taking your rifle out of action until new rings are purchased and installed.  This is why our rifles don’t function as flawlessly as usual with steel ammo.

There is also a lacquer coating on steel cases that will gum up in hot chamber that will cause even more issues.  Yes, you can cycle steel ammo through our rifles but you must keep in mind that this ammo is very untrustworthy and dirty. This can cause you some cycling issues because we do hold tighter tolerances for our systems. It may require more frequent and thorough cleaning of the chamber , gas system, and BCG. I would recommend, not just with our rifles, but any firearm, to use a higher quality ammo.

If you are looking for high quality ammunition for a reasonable price, we recommend our Core Ordnance Ammunition.



Trigger Guard Installation

CORE® Rifle Systems will not cover broken or damaged receivers caused by trigger guard installation. Below is a video on how to install the CORE® Oversized Triggerguard.





Safety won’t engage

While there is the possibility of a burr (a rough edge or ridge) on the safety detent keeping your safety from engaging, most of the time the issue is that the hammer isn’t engaged. If the rifle has been dry fired and the hammer is disengaged, that will cause the weapon not to go back on safe. Simply pull the charging handle and and that should reset the hammer to be able to move the safety selector.



Case Stuck in Chamber

Contrary to popular belief, your chamber needs to be cleaned before use. Our rifle chambers are match-grade which means they are tighter and are less forgiving with debris and dirt.  

When rifles are shipped out of our factory we have a protective coating in the chamber that protects against the possible long-term storage and debris from shipping.  This needs to be scrubbed and cleaned out or it will act as a suction/wedge that will prevent the rounds from extracting. 

The recommended tools for this job are a chamber brush and chamber mop (Fig.1). We recommend the Otis Cleaning Kits, they come with everything you need for cleaning and maintaining your firearm.  The chamber should be flushed after the brushing and coated with a quality gun oil.

If you have attempted to fire the rifle and an empty case is stuck in the chamber there are two ways to resolve this depending on the situation. 


  1. If the bolt has ripped the lip of the casing off (Fig.2) you will first need to get the bolt locked to the rear. This is done by putting your thumb on left side of receiver on the bottom of the bolt catch, then pull the charging handle while maintaining pressure on the bolt catch. Once the bolt is locked back insert a cleaning rod down the bore to remove the casing.  
  2. If the bolt is still latched onto the round then whats known as “mortaring” will need to be done. ALL REGULAR SAFETY PRECAUTIONS SHOULD BE FOLLOWED!
    1. Close the butt-stock fully
    2. Point the muzzle to the sky
    3. While holding the handguard/forearm and pull down on the charging handle and pop the butt-stock on the ground with increasing force to dislodge the round.  

If you are confident the chamber has been thoroughly cleaned and you are still experiencing this malfunction then you may have a rough chamber that needs to be sent back.  Please fill out a claim ticket and we will get the rifle back here to be repaired.



Not picking up the next round (short-stroking)

If your rifle is ejecting the spent round that was just fired (or not ejecting and can be pulled out) but is failing to pick up the next round, crushing your round halfway up the feed ramps, also known as stove-piping, there are a few possible at home fixes.

The first thing to check would be your gas block which would be the two pictures below labeled gas block (fig. 2 and 3) for reference.

To resolve this issue, simply push the gas block back up to the shoulder cut into the barrel, keeping the gas block as straight up as possible, and tighten down the two set screws underneath. I would recommend some blue loc-tite to help keep the screws from vibrating back out again.

If your gas block seems to be in the right place and your rifle only experiences this malfunction every few rounds then it may be that the gas rings have aligned (Fig. 4).

Normally the manifestation of this malfunction would be a stovepipe or the round getting crushed on the feed ramps (Fig. 1).

This is something that should be checked with every rifle maintenance session and is easy to fix by un-aligning the rings.

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