Gas Blowback Rifle Conversion Kit- Angry Gun, HAO, Maddog, and RA TECH are providing the kind of Conversion Kit such as the HK416D kit, John Wick M4 Rifle Kit, Noveske N4 Rifle Kit.
The handguard itself is very nice and well-made, I have no comments about it, it is as it should be. The problem was the extra contents of the package, as one of the screws and the barrel extension shown in the photos were missing. For the price I'm quite disappointed with this