My Cart



Order Processing

We work hard to get orders out as quickly as possible, but our demand does fluctuate.  Please allow 2-3 days for order processing.

RMR Screws

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

1. Optic Mounting: Our slides come with two screws for mounting your optic.  The longer screw (3/8 in) goes on the LEFT (non-ejection port) side.  The shorter screw (5/16 in) goes on the RIGHT (ejection port) side.  The screw on the ejection port side is shorter to prevent it from interrupting movement of the extractor depressor plunger assembly inside the slide.  

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.

 Slide-to-frame Fit (Glock Factory Frames)

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.

Silde-to-frame Fit (P80)

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. 


What finish should I get?

We are fortunate to live in a time when there are many good firearm finishes exhibiting awesome corrosion and wear resistance.  We offer three primary finishes although cerakote can be ordered as a custom option.  Here's what you need to know:

TiN and Bronze TiN: Titanium Nitride is great looking gold or bronze finish that was used to keep cutting tools sharp long before making its way into firearms. Some people are puzzled by the gold/bronze barrel thing, but it is not just a fashion statement.  TiN is super hard and incredibly smooth, again lowering the friction between the frame and the slide.  The fact that it adds a cool accent color and looks great is a happy coincidence.  Just don't forget it was chosen for barrels originally because of its material properties, not its looks!  Bronze TiN and Gold TiN both exhibit excellent material properties, although the Bronze TiN is slightly harder (but they're both great).


DLC: DLC is probably our favorite finish.  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 rudimentary tests, it also had better rust prevention than Nitride.  

 Flutes?  Dimples?  Why?

Yes, we know guns were reliable and accurate before people machined flutes and dimples on them!  However, there are a few advantages to fluted and dimpled barrels.  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 (flutes), better cooling, and weight reduction.  Oh, and did we mention they look cool?  What's not to like?  


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.

Warranty / Returns

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. 

ITAR Restrictions

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.   

FFL Transactions

For all FFL Transactions contact


Earn 10% Off Your Next Order!

By signing up for our emails