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Posted: 1/17/2021 2:43:26 PM EST
[Last Edit: 1/14/2021 11:28:18 PM EST by Utahshooting]
Seen some good videos on these. Do they really work that well with all mags?  From the reviews, it sure seems so.  Are they perhaps finicky with what upper brands you use?

Gonna Form 1 my favorite AR pistol and was thinking of building upper in 9mm and buying one of these.  I see mag release is in a unusual spot but son and I are both Lefty's so it's all good. Lack of last round bolt hold open doesn't bother me.  It'll be a range and pinking toy

Got a Fostech binary trigger in AR lower. Will it cycle 9mm well?
Link Posted: 1/15/2021 8:28:24 PM EST
No one has ever used one?
Link Posted: 1/15/2021 9:55:38 PM EST
Link Posted: 1/17/2021 2:43:26 PM EST
[Last Edit: 1/17/2021 2:43:26 PM EST by Lancelot]
Topic Moved
Link Posted: 1/18/2021 8:35:17 AM EST
I have one in a Spike's lower and it works well. I've found that the ETS 31-round mags and the factory Glock 17 mags slide in and out the best. My Glock 19 mags are a little tight (and short), and the RWB 33-round mags are a little tight and require a strong tap on the baseplate to seat correctly.

That being said, they all feed with no issues so far. The only thing missing from the Sylvan is LHRBO, but I like the placement of the mag release (4.5" barrel so I generally grip the magwell anyway).
Link Posted: 2/2/2021 10:14:49 PM EST
I have not used, but I bought the Orion one.  Really basic.  Unfortunately, they are not sold (I heard that the seller passed away)

But have you looked into the adapter by Matador.. their Mag X adapter?  https://shopusa.matadorarms.com/Mag-X_p_73.htmlAttachment Attached File
Link Posted: 2/8/2021 1:42:38 PM EST
Use an Aero Precision lower and couldn't get the Sylvan mag block to consistently eject with a FoxtrotMike upper.  Finally just bought the matching lower and it runs fine.  Eats 124 and 147g ammo without any problems unsuppressed.  Still working on reloading ammo for suppressor but did find factory ammo that works.
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