We work hard to get orders out as quickly as possible, but our demand does fluctuate.  Please allow 2-10 business days for parts orders; 6-8 weeks for pistols.


First, if you lost your screws, call us and we’ll send you some for free.

There are three lengths of screws related to our RMR cut slides.

1. Optic Mounting:

  • Trijicon RMR: The longest screw (3/8 in) goes on the LEFT (non-ejection port) side.  One of the shorter screws (5/16 in) goes on the RIGHT (ejection port) side.
  • Holosun: Certain Holosun optics, notably the 507C, fit the slide cut.  However, both screws must be the shorter length (5/16).

2. Cover Plate Mounting: We ship 1/4 inch screws for mounting our cover plates.  The longer optic mounting screws will “bottom-out” before making contact with the cover plate and will not work.

The following applies to both stripped slides and complete top end kits.

Our slide rails are tighter than Glock factory but are designed to drop-in fit the vast majority of factory frames.  However, in some cases, the slide will be too tight due to variances in Glock’s stamped rails.  Stamping is great, but it will never be as precise as a machined part, and if the rails wander a little, the slide can get too tight.

Unless things are obviously too tight, we recommend you shoot the gun first as it is remarkable how 150-200 rounds can break things in.  However, if the slide is still too tight on the rails after break-in, try this:

1. Remove the top end from the gun.

2. Make a light single pass on each slide rail with a file.  Reassemble and check fit.  Usually, repeating this 2-4 times will get you there, but it can vary.  Call us if you need some help (469) 458-6808.

3. Once the slide is moving freely, you are done.  If you would like to polish the rails with some fine sandpaper, you can do so, but this really is not required.

4. We believe reliability is paramount.  Your slide to frame fit does not need to be insanely tight for the Glock design to be accurate.  Most of the accuracy comes from the slide to barrel fit and barrel quality.  A little bit of play in the slide to frame is good from a reliability perspective and will not harm your accuracy.

The following applies to both stripped slides and complete top end kits.

We are commonly asked about fit issues with our slides on P80 frames.  We think highly of the P80 frame and enjoy building them, but we have also seen fairly large variances in P80 frame rails from one frame to the next.  Some will go together with very minimal fitting, others require substantial fitting of both the front and rear rails.

As the builder, your goal is to remove enough material from both the front and rear rails to ensure smooth movement of the slide THROUGHOUT ITS TRAVEL.  If the slide sticks or binds when pulled to the rear (common on P80), there is more material to be removed.  How you remove material is up to you, but we recommend using hand tools to ensure you don’t overdo it.  A stone or flat file works well to start and then finish with progressively finer grits of sand paper until you are satisfied.

Front rails stoned down and highly polished.

Rear rails stoned, tapered, and polished.

We realize you want to be conservative when removing material from your frame, but in the vast majority of cases where fit issues persist, the solution is simply to remove more material.  Marking your rails with a sharpie and cycling the slide can help you see where the issue is.  Once you have polished and adjusted the fit of your frame rails, you will have an accurate and reliable handgun.

We are fortunate to live in a time when there are many good firearm finishes exhibiting excellent corrosion and wear resistance.  We offer two primary finishes:

Titanium CarboNitride (TiCN) a.k.a. “Bronze TiN”: You may have seen gold colored Titanium Nitride (TiN) before in the firearms industry.  We have used it extensively in the past and it is a very good finish that has become quite popular.  However, we have seen such an improvement with bronze Titanium CarboNitride (TiCN) that we now use it as our go-to barrel finish.  TiCN is basically gold TiN’s lesser known, tougher cousin.   TiCN is about the hardest thing out there and offers superior corrosion resistance and lubricity.  We like the fact that it looks great, but it was originally chosen for its material properties.  This finish is used frequently in industrial settings, in particular, on cutting tools used on very abrasive materials.

DLC: DLC is the best black colored finish in the industry.  The letters stand for “diamond like carbon,” a name which comes from the process of using carbon to form a super thin, hard, smooth layer on the surface of the metal.  DLC is really good looking and has a very low coefficient of friction, reducing the friction when cycling the slide.  In our tests, it also had better rust prevention than Nitride which is a much cheaper black finish used frequently in the firearms industry.

Yes, we know guns were reliable and accurate before people machined flutes on them!  However, there are enough advantages to fluted barrels that we have incorporated them into the design.

Probably the most important impact is that they give debris a place to go when your slide is cycling, enhancing reliability.  They also tend to “hold” lubricant, keeping your slide lubricated a little longer and distributing it evenly.  Lesser impacts include: better barrel rigidity, better cooling, and weight reduction.

Dimpled barrels are nice too and we’ve produced them in the past.  But our experience is that flutes are the way to go when you focus on function.

We currently accept payment from all major credit card / debit card companies. Payment is taken at the time of your order and authorization must be approved before we can deliver your order.  All pricing is listed in and all payments are received in US Dollars.

We also offer gift cards for those who can’t decide what to get their favorite shooter.

Customer is responsible for all shipping and freight charges.

We wish we could control the carriers, but sometimes they miss their deadlines.  We will not be responsible for shipping delays caused by any carrier.

Shipping rates are calculated based on weight, destination, and shipping service. Your final shipping and handling amount will be displayed before your place your order

You must notify us at time of purchase if a signature is required for residential deliveries. We are not liable for any lost or stolen goods that are delivered to a residence without requiring a signature.

OFFICIALLY: Five Year Limited Warranty

Shadow Systems products are guaranteed to be free of defects in materials and workmanship that adversely affect operation for a period of 5 years from the date of original purchase.  If there is a problem with your product, we will take care of it, just give us a call.  No need to fill out a warranty card, keep the original receipt, or sign an affidavit.  This warranty is fully transferable.  The warranty does not cover loss, theft, deliberate damage, or cosmetic damage that does not affect function.

HOWEVER: If you EVER have a problem, give us a ring and we’ll do our best to get you squared away.

You can check your balance on an existing gift card here:


The sale, transfer, transportation, or shipment outside of the U.S. of many of our products is prohibited or restricted for export without complying with U.S. export control laws and regulations. Violations of these export laws are subject to severe criminal penalties. The purchaser and recipient of any of our items must recognize their legal obligation to abide by all laws in regards to the international Traffic in Arms Regulations (ITAR) and the U.S. Export Administration Regulations (EAR). If you wish to purchase an item for ultimate shipment or use outside of the United States make sure to check our dealers for one of our international partners.  Please contact us if you have questions or require additional assistance.

For questions about FFL Transactions contact support@shadowsystemscorp.com. If you need to look up a local FFL for shipping, please click here.

Have additional questions? Feel free to contact us at support@shadowsystemscorp.com and someone on our team will respond in short order.