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Ultradyne
Overview
The Ultradyne USA Vostok Compensator is designed specifically for 7.62x39mm AK rifles, featuring a left-hand thread pitch of M14x1. This muzzle brake effectively reduces recoil and muzzle rise, enhancing overall control during rapid fire. Commonly found in mid-length gas system builds, it offers a practical solution for builders looking to improve accuracy and shooting comfort in their setups.
Ultradyne USA Vostok Compensator Muzzle Brake Fits 7.62x39 AK Rifles w/ LH Thread, Black Nitride - UD10870
Ultradyne USA Vostok Compensator Muzzle Brake Fits 7.62x39 AK Rifles w/ LH Thread, Black Nitride - UD10870 was the eighth most added muzzle device on GunPartPicker in August 2026, behind the SureFire SOCOM 4 Prong 5.56 Flash Hider - Suppressor Adapter - 1/2x28, with about 4% of all muzzle devices added to builds. Down from #5 in May, June and July. Builds with this muzzle device are mostly chambered in 5.56 NATO (88%, then 6.5 Grendel 13%), split between mid-length (50%) and carbine-length (17%) gas systems, and nearly all AR-15.
Availability is good: it was in stock at one retailer or another nearly every day in August 2026, and today 6 of the 7 retailers we track have it in stock. It dipped to $63.43 at BattleHawk Armory for a stretch in August 2026, under its usual $67 to $72.91, so sales do come around. Buying today, the lowest price is $63.43 at BattleHawk Armory, which matches the best price we saw in August.
Updated · from real builds on GunPartPicker · Prices checked · refreshed daily across 31 retailers
We ranked every muzzle device by how often it shows up in real builds on GunPartPicker.
Read the guide: AR-15 Muzzle Device Guide →Check it against the live catalog:
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Aggregated and anonymized data showing how builders use this product
Builds in the community that include the Ultradyne USA Vostok Compensator Muzzle Brake Fits 7.62x39 AK Rifles w/ LH Thread, Black Nitride - UD10870
| Build | Parts | Total |
|---|---|---|
 | 14 | $947.71 |
 | 14 | $1349.99 |
 | 23 | $1577.93 |
 | 14 | $1229.73 |
 | 13 | $1051.42 |
 | 14 | $1352.64 |
| 22 | $4893.66 |
 | 15 | $2824.20 |
 | 26 | $2733.61 |
 | 10 | $1214.50 |
| 17 | $4407.97 |
2 global ratings
Top reviews
Ultradyne Vostok compensator on my AKM drops flash signature meaningfully along with reducing muzzle climb. Install was straightforward with a crush washer. LH threading was correct for an AK. Side ports vent up and away.
Ultradyne Vostok comp on my AKM significantly reduces felt recoil and muzzle rise. LH threading was correct for an AK. Side ports vent up and away. Crush washer indexed easily.
