For answers to your questions, we recommend checking out the Help Center articles. If you still need assistance, feel free to reach out to our Support Team through the Contact Form—we're happy to help!

Become a JMac Dealer

JMac-Customs

<p>Yes, the MMS Gas Tube is a suitable mounting surface and will maintain zero.</p>

Yes, the MMS Gas Tube is a suitable mounting surface and will maintain zero.

Can I mount an optic onto the MMS Gas Tube?

MMS (Modular Mounting System)

Do you offer refunds or exchanges?

What is your returns policy?

When will I receive my refund?

Shipping & Returns

Out of Stock Products

Is backorder available for out of stock products?

Can you manufacture a one-off product?

Where can I find reference images / videos of your products

Top Selling Products of 2024

General Product Questions

What muzzle devices are compatible with my firearm?

What muzzle devices are compatible with my suppressor?

What is facemount?

How can I attach my Dead Air Wolverine to my firearm?

What’s the difference between KeyMount and KeyMicro devices?

Which devices are compatible with “X” caliber?

Why do some muzzle devices have a barrel length restriction?

How do I install KeyMount, KeyMicro, or X-Series muzzle devices?

Muzzle Devices

Which adapter(s) do I need to add a stock/brace to my firearm?

Which length stock/brace do I need?

Do you offer a stock/brace that locks in the folded position?

I’m having difficulty unlocking my FM-SM-1913 Folding Mech.

Do you offer a stock/brace that folds around a side mounted optic?

Which height cheek riser do I need?

Stocks and Braces

Can I use your MMS Lower Handguard without the gas tube?

Do I have to remove my sling loop to install the MMS Handguard?

How do I create an account?

How do I use my store credit?

Do you offer Dealer accounts?

Account Information

I’m local to you, can I pick up my order in person?

What’s the status of my order?

When will my order ship?

My order was lost in transit or delivered to the wrong address

Do you offer express or expedited shipping?

Do you ship internationally?

Can I cancel my order?

Can you add or remove an item from my order?

Orders & Shipping

Is JMAC Customs a large corporation?

Do you offer FFL services?

Do you offer installation services?

What is the best form of contact?

About JMac

Handguard Compatibility

X-Series Devices and Compatibility

KeyMount / KeyMicro Devices & Compatibility

Product Fit and Compatibility

Can I mount an optic onto the MMS Gas Tube?Updated 4 months ago