Home/Accessories/Thread Adapters/SIG MOSQUITO, GSG FIREFLY Adapter with Thread Protector, 1/2″-28 TPI

SIG MOSQUITO, GSG FIREFLY Adapter with Thread Protector, 1/2″-28 TPI


(4 customer reviews)


Threaded Barrel Adapter for use with rimfire SOUND SUPPRESSORS or other muzzle devices.

Metric to U.S. Standard Adapter W/ Fluted Thread Protector


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SKU: 047 Category:


Suggested Retail Price $19.95

SIG MOSQUITO M9 x .75 to 1/2-28

This is what you need to switch your Sig Mosquito or GSG FIREFLY pistol to use standard U.S. 1/2-28 threaded sound suppressors or other muzzle accessories. Our threaded barrel adapter easily replaces the factory barrel nut. To install it, all you have to do is remove the factory barrel nut with the factory supplied wrench and then replace it with this adapter which will give you the 1/2×28 U.S. standard configuration. A machined thread protector with a fluted OD is also included in the price so that you won’t run the risk of damaging the threads when muzzle accessories are not being used.

Packaged by the manufacturer (Hughes Precision Products LLC) in non-retail packaging, such as an unprinted box or plastic bag

Manufactured From 4140 Alloy Chromoly Steel With Black Oxide (blued) Finish.

All of our products are manufactured IN HOUSE.

We only make parts for the shooting sports.

Made In Michigan U.S.A.

Additional information

Weight 1.6 oz
Dimensions 2 × 1 × 1 in

4 reviews for SIG MOSQUITO, GSG FIREFLY Adapter with Thread Protector, 1/2″-28 TPI

  1. Joe (verified owner)

    Nice machine work, nice thread protector, and a good company. Fit and finish is nice. Threading feels smooth and precise, no wobble, etc. as threading it on. It is great for any muzzle devices and is concentric with the bore.

    I ordered on Mon or Tues and had it in hand 4 days later.

    Very happy with this purchase and I will certainly not hesitate to buy from Hughes again.

  2. Justin (verified owner)

    Fit and finish are excellent this is the second adapter I’ve bought for them and both were great.shipping is crazy fast got it the next day

  3. Mark Christian (verified owner)

    Best adaptor on the market and at the best price. Top quality machining throughout, and the protective end-cap is well made and attractive.

  4. Aaron Leonard (verified owner)

    super fast shipping. Ordered on the 28th got it on the 30th. The product actually works for the price too. The fit is tight but perfect for both the threads on the pistol and the muzzle device. Kudos, an American made product that actually works.

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