AIM Top Hop-Up Spacer for Airsoft AEG Hop-Up Units (Model: Type A + B / Pack of 3)

"These are pretty great. I use the type A along with the emg atlas blue flathops and get fantastic results, better than maple leafs. The type Bs I use with PDI w-hold for barrels with smaller windows, and on my G36 hopup w/ flathop since that chamber only has room for a cylindrical nub and type A wont fit. Accuracy and range are a little less than it would be with the type A. Overall very satisfied with the quality and price. You get 3 for $12 versus $6 each for the maple leaf ones. These appear to be more symmetrical as well.

"When will more of these be in stock? I'm planning on building a custom M16 soon, and unfortunately, the barrel I want to put in it is a 590mm.

"i just got it today. very sturdy doesent wobble at all even with a plastic body. it is a two peace barrel but the second peace is twords the center. I know sofare it will fit on classic army tm and echo1 m4/m16. it is a 20 inches. all in alll great barrel