I'll send you an adapter free of charge to test fit against RB's under the condition you post back here you exact findings. I have seen enough "speculation" and I'm willing to put my money where my mouth is. The MSA adapter is no harder to fit, it requires the same amount of work. And that WORK is subject to YOUR installation skills which we can agree varies from person to person.
Yes my instructions may seem like "Brain Surgery" but I am an engineer and deal in facts and exact measurements not shade tree dremel guesstimates. My adapter requires .06" of material to be removed outside of the given dimensional mag standards .90". I have seen cowboy dremel jobs remove more than that. So if we are splitting hairs over .06" then I find this laughable. I pay insurance to cover product liability. You have to submit, in detail, how to install* and packaging information to the underwriter to even be considered for insurance.
*But also in my instructions are pretty pictures for those who don't like to read
When dealing with a firearm that has the potential to kill you, should it fail, where do you compromise your safety? Fact of the matter is I have had ZERO, let me repeat ZERO, rifle failures reported with use of the MSA adapter. Not bashing, just stating a fact. Two installers used dremels and destroyed their rifle. Cause of failure (from an engineers perspective) improper installation and the excessive removal of material. I offered to buy the guys riffle to lay this issue to rest. However he has alternative plans to replace and use the MSA adapter.
Bottom line. I will provide you a safe, precision engineered/precision CNC manufactured rifle accessory constructed from T6061 aluminum. Mil Spec anodized...... that weighs in at 4oz. The instructions to install and pretty pictures to stare at. If you wish to take me up on this offer please email me and reference this post so I will recognize who you are.
And a bit of news while I am here. MSA is releasing a LRBHO for our adapters next month.