Summer Cleanout Sale!
Huge Savings On 2000+ Items From 200+ Brands - SHOP NOW

Daily Deal: Brownells Acraglas 2-Gun Bedding Kit ~~$27.99~~ $21.99 - Get Yours!

MARKSMAN V4 SLIDE FOR GEN 3 G21 Reviews & Ratings

In the world of Glock®customization, the Glock®G21 seems to get short-shrift, since everything's made for either the 9mm or .40 S&W variants of popular Glock®handguns. Fans of the big-bore .45 ACP are left in the dust with their OEM models, but the Marksman V4 Slide designed for use in Gen 3 models of the G21 allows owners of these guns to step up with a clean, custom look. Each Marksman V4 G21 Slide is machined from 416 stainless steel in order to ensure long-lasting performance, and the rear of the slide is milled to accept a Trijicon RMR or a Holosun 507 red-dot sight. The slide is finished with a DLC PVD treatment, and other highlights include enhanced serrations for more positive manipulation of the slide, as well as a clean, attractive finish. The Marksman V4 G21 Slide is designed for use on Gen 3 Glock®G21s or P80 PF45 handgun frames only.

View Product

Write a review

5 Stars

75%

4 Stars

3 Stars

2 Stars

19%

1 Stars

Reviews Summary

The MARKSMAN V4 Slide for Gen 3 G21 is well-received for its aesthetics, compatibility with optics, and smooth operation. While many praise its quality and fit, a few customers face issues with manufacturing tolerances and customer service responsiveness. Overall, it’s a favored choice among users looking for an upgrade.

What Reviewers Are Saying

Product Quality

73%

Reviewers generally describe the slide's quality as impressive, noting its aesthetic appeal and functionality. Many enjoy the fit and finish, highlighting its design as a significant upgrade for their firearms.

Optics Compatibility

60%

Several users appreciate the optic cut design, which allows for easy installation of red dot sights. This feature enhances accuracy and user experience, with many mentioning specific models that fit perfectly.

Assembly and Fit Issues

33%

A portion of reviews mentions challenges with fitting the slide onto frames, requiring modifications or assembly efforts that deviate from standard builds. Some customers report receiving slides with quality control issues.

Customer Service

25%

While many had positive experiences, a significant number faced disappointment regarding customer service when trying to resolve issues related to defective products or assembly problems, indicating a need for improvement.

Value for Money

47%

Despite being priced higher than OEM options, many reviewers express satisfaction with the slide, believing it justifies the cost through improved functionality and aesthetics, while others feel some aspects do not match the price.

Customer Photos & Videos

Sort by Filter by rating

Alpha Shooting Sports G21 Slide

Upgraded my Shooting Game with the Alpha Shooting Sports G21 Marksman V4 Slide. Sweet slide. Highly recommend.

Smooth Operator, Highly Recommend

I wish I could have had this on the field 10 years ago, lol. Looks good, feels good and shoots good. What else do you want? Finally something different for this dying caliber.

Highly Recommend, Nice looking slide.

This is a really nice looking slide. 100 or so rounds down range so far and no issues encountered. I want to get a red dot for it and some tall sights. I used a parts kit from Alpha Shooting Sports to build this out and everything fit perfect.

Good slide for the money and in hard hitting 45ACp, super elegant

The optic cut on this slide is a game-changer. It allows for the seamless installation of my Holosun 507c, enhancing accuracy and target acquisition. The precision of the cut ensures a perfect fit. It co-witnessed with my tall iron sights. A fantastic added bonus.

Different story from previous reviews. Perfect fit and finish on this Alpha Shootings Sports G21 V4

This one Alpha Shooting Sports G20 V4 slide transformed my Glock into a shooter. The slide's quality is impressive and the improved serrations give me a solid grip. Optic installation was a breeze with the RMR cut (make sure your RMR is not a fugazi). Worth every penny and I highly recommend.

Sick Slide

My eyesight is going bad and I wanted to run a red dot on my Glock 21. There isn't a whole lot of RMR G21 aftermarket slides available. I'm using a Holoson 507c and it fit snug. I ran a hundred rounds through it with no issues. The design on the slide is sick!!!

Great Gift

Got this for Christmas and didn't get to shoot it until a week ago. The beginning was a little rocky, but after about 50 rounds everything broke in and was smooth sailing from then on. So far, I've shot about 400 rounds and it's been rock solid.

AWESOME FIT AND FINISH - RELIABLE SO FAR

This is my new favorite slide. Assembly was straight forwad and I had no issues. Fit and finish is immaculate. My 508T X2 red dot found a new home and went on with no problems. Same with my SRO fit like a glove. Put a couple hundred rounds of winchester whitebox and it ate them all. Mine came with a channel liner installed, sweet! Saved a few bucks.

P80/ Alpha Marksman V4

The Marksman V4 was the finishing touch to my P80 PF45 build. I mentioned that fitting was required but that's a P80 frame issue not the slide. I bought the slide because it gave a me a few more options on configuring the gun with a future RMR installation. Range checked the build and it was 100%. Although the slide was expensive, I'm happy with end result.

Great slide

Workes great love being able to put a rmr on my 21 I like the side porting didn't care for the top cut out but it doesn't hurt the function of it. It hasn't had any problems cycling with a lone wolf barrel after about 270 rounds.