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A5 and legacy Hk416 receiver compatibility

330 Views 2 Replies 2 Participants Last post by  redmax29
Sorry if this is a dead horse question but I'm a noob to the 416 world sans the M27 and am just starting out on a new project. I acquired a bunch of the recent Brownells released HK416 components in hopes of building an M27 type upper. The stripped upper they sell is labeled as a surplus genuine 416 upper. Now in my hunt for a lower I discovered that Black Ops Defense is going to be doing A5 type lowers in the near future.

My long story short, is the legacy HK416 upper compatible with the A5 lower? I know there are some minute differences but have no idea if this is an issue. Thanks for advice!
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