Instruction: Analyze a question and its supporting document. Predicting answerability based on the information provided in the document. Output yes if the document contains relevant information to answer the question, otherwise output no.

Input:
Question: will these work with the promag aftermarket magazinse that are made for the lcp 380
Document: The LCP 380 size is made for concealed carry the Pearce grip is a fitting addition and helps to steady the aim with a more firm grip, thanks much. .....fr
The extension grips for this gun are a great idea but with my medium hands my pinky rests right on the tip of this length of  grip. Otherwise my fingers are crowded. I'd much rather go with the smaller extension grip that came with the gun (Ruger .380 LCP) and comes with most extra Ruger magazines that you buy. It just make sense to me to go without the pinky otherwise the extension that is out there and would work for me would be too ungodly to pull out of my pocket.
You get a pair of these extensions in a pack. THey are really nice. WOrk well. BUT..they only work for FACTORY or Ruger-made magazines. You should only get the Ruger mags anyway....
Bought these magazine extensions for my Ruger LCP .380 cal. ACP magazines. These Pearce extensions are bigger and provide a significantly better grip than the Ruger-made extensions. The Pearce extensions are high quality, sturdy and shaped  in such a way so they do not add significant bulk to this pistol in concealed carry. They also do not add time or effort to quick draw from concealed carry in pocket holster or concealed holster.
This is one of the best modifications you can do for your lcp under $10 . You can install on your clip in seconds
works like it should, adds a little more area to grip on your lcp.. a must have for us males with dinner plate hands.
The magazine will not seat properly on the newer lcp models. I'm going to try and sand down the extension or something but beware if you have a new model lcp. This extension will not allow your factory mag to seat properly.
These extend the grip on my lcp mag more than the factory extended magazine but I have trouble re-inserting the magazine and getting it to catch (compared to the factory plate). I have tried this with the slide open and closed and the results are the same. Hopefully a design update will fix this issue.
I gave this item a 5 star rating due it working well for the intended user.The extension was bought for a female with smaller hands. This allowed her to get a 3 finger grip on the lcp instead of the usual 2.The only downside is if you have larger hands.
I bought the ruger lcp awhile back and I love the gun, the only problem was it is so small I couldn't get a good grip on it, I bought it to conceal so I needed to figure out something to do. So I got on amazon and came across this product and its like holding a new gun.
Answer: yes