Return to SYLVAN ARMS 9MM CONVERSION BLOCK - GLOCK MAGS - GCB100

Sort By:: Most Helpful Newest Rating: High to Low Rating: Low to High	Page of 25

0 of 0 people found the following review helpful:

9mm Conversion October 2, 2025 : Mike from Alabama   Fits my lower perfectly. Excellent service again from the folks at MAS Defense. Was this review helpful to you?

0 of 0 people found the following review helpful:

Keeps AR15 an AR15 March 12, 2025 : from Texas   Fits as expected.  Glock mags fall free with a pull of the release.  I like the fact that I can keep my mult-caliber lower, and just change out uppers without too much adaptation. Was this review helpful to you?

0 of 0 people found the following review helpful:

Solid April 13, 2024 : Tommy McQueeney from blythewood, SC United States   In my experience sylvan is get what you pay for. There are more premium alternatives but the conversion functions as advertised. Works with my glock and ets mags Was this review helpful to you?

0 of 0 people found the following review helpful:

First AR build July 16, 2023 : David Neuss from Tucson, AZ United States   The service, selection, and pricing, were AWESOME! The items processed amd shipped quickly. Everything was as ordered. Thank you Was this review helpful to you?

0 of 0 people found the following review helpful:

Magazine conversion. July 8, 2023 : Steven Wagner from Holly , CO United States   This arrived and in 5 minutes I had it installed. Would have been sooner if I had noticed the wrench taped to it. Duh me. Work great. Was this review helpful to you?

0 of 0 people found the following review helpful:

April 23, 2023 : John Maplethorpe   Awesome experience. Had what I needed, shipped quickly and even called me to confirm shipping and billing addresses. My order was delivered cross country in less than a week. Will work with them again. Was this review helpful to you?

0 of 0 people found the following review helpful:

Awesome product March 24, 2023 : Angel Rivera from Moscow, TN United States   First time purchase and I'm extremely satisfied with my purchase and fast shipping and processing of my order. Was this review helpful to you?

1 of 1 people found the following review helpful:

AR-15 Glock Conversion Block March 10, 2023 : Patrick Miller from Valley Center, KS United States   Junk. It scored my magazine well because it was too tight. The mag release cracked and the spring fell out. Don't waste your money. ------------------------------------------------------------------------------------------------------------------------------------------------ MAS Defense Reply: Patrick, I apologize for the issue. We have sold thousands of these Sylvan Conversion Blocks with 99% customer satisfaction. The block should have dropped in or at the most required very little pressure to slide into the magwell.  Forcing it in to the point it cracked under pressure or left marks should not happen. Customer service will reach out to discuss further. Thank you for your business and your feedback! Was this review helpful to you?

0 of 0 people found the following review helpful:

Sylvan arms 9mm conversion block March 9, 2023 : Richard Giguere from Swanzey, NH United States   Fit and works perfect Was this review helpful to you?

0 of 0 people found the following review helpful:

Same mags as sidearm February 19, 2023 : Glen Richert from Thermopolis , WY United States   Looks great, fits great, feeds great. Good mag lock-up. Nice that it uses the same mags as my pistol Was this review helpful to you?